Device for identification and method for scanning the same

FIELD: information carriers, in particular, universal magnetic identification device.

SUBSTANCE: identification device contains code elements positioned on substrate with different coercive intensity. Each code element is made of magnetic-soft material, to which through non-magnetic insert connected magnetically are grouped together, having similar shape and dimensions, of same domain during magnetization in direction of axis of light magnetization, discontinuous elements, which possess greater coercive intensity than magnetic-soft material. Method for scanning device includes serial magnetization by means of external field of elements with varying coercive intensity, registration of electromagnetic impulses occurring during that and their processing, while for magnetization alternating-sign magnetic fields are used with varying speed of their change in time.

EFFECT: amplification of signal used during scanning, increased information capacity and expanded area of possible use of device for identification due to possible spatial distribution of device and means for its scanning, and also increased reliability of its activation, improved manufacturability and decreased manufacturing costs.

2 cl, 16 dwg

 

The invention relates to storage media and can be used to create a unified devices for storing and reading information, for AMID tags (electromagnetic identification tags), EAS tags, locks with electromagnetic control, alarm systems, etc.

A device for coding used to identify objects, and including, as plastic cards for subway (JP 06-243302 /1/). The known device is a plate made of a nonmagnetic material (paper, plastic, non-magnetic metal and the like)on which or within which is placed the code elements of the magnetically hard material with high coercive force. When exposed to an external magnetic field, the magnitude of which is sufficient to reverse magnetization at the time of magnetization reversal they emit electromagnetic pulse, the magnitude of which depends on the element size (the amount of magnetic material in it) and properties of the material from which it is made (the Barkhausen effect). The code elements are of rectangular shape, for example, a foil thickness of 20 to 250 microns and a length of 50 mm and placed on a plate (or inside it) so that their longitudinal axes were parallel to each other and perpendicular to the direction of movement of encoder is otnositelno reader device.

A disadvantage of the known device is its poor processability due to the necessity of use in its manufacture of different materials to create different code elements with different coercive force. Moreover, for reliable identification is necessary to observe certain orientation code elements relative to the reader device.

A device for identification, which contains a layer of soft-magnetic material and located above them sequentially areas with a high coercive force, and then with an average coercive force (US 4956636 /2/). In this device, the function code elements are areas with an average coercive force, who at the time of reading data subject or the degaussing (erasing data), or the magnetization reversal. Areas with a high coercive force are used to increase the integrity of the recorded using the code information elements, and the presence of a layer of magnetically soft material allows you to facilitate demagnetization or magnetization reversal in the process of reading the encoded information. A disadvantage of the known device is the complexity of the industrial production of labels due to the necessity of using different materials for different layers. Even greater problems arise in the manufacture of mn is gabitovich labels, since in this case, you must use and Assembly of a large number of different materials with different coercive forces. These circumstances make it difficult to manufacture the labels in this way and significantly increase their price.

A device for identification containing the magnetic elements and the method of reading coded information (US 5583803 /3/). Single code element in the known device includes a substrate on which is placed layers of amorphous magnetic material, over which is applied a non-magnetic intermediate layer, and over it a layer of magnetically hard material. In private cases, the implementation on top of a layer of magnetically hard material is applied to the second non-magnetic intermediate layer, and over it a layer of soft-magnetic material. For reading the encoded information, the device identification is exposed to two magnetic fields of permanent or quasi-permanent (frequency 10 Hz), the tension of which is slightly smaller (˜10%)than necessary for the magnetization reversal magnetic solid material, and AC with a frequency of 400 Hz, the intensity of which in total provides constant switching of magnetization. In some cases, there are significant limitations on the conditions read these labels and, accordingly, the scope of their use.

From the local system spatial magnetic survey, which includes the device identification information labels, which use very small amounts of magnetic material with high magnetic permeability, and the scanned magnetic field survey, which uses the relative movement between the magnetic information label and applied field (US 6373388 /4/).

Due to the fact that in the known system uses the relative movement between the label and the applied magnetic field, there should be consistency between the temporal region of the output signals of the device reading the labels and the linear dimensions of the active magnetic attitude of the label areas and gaps between active magnetic attitude areas. In this sense, the active region and the gaps between them are similar to elements of the optical bar code reader (black bar or a white gap between adjacent strokes). From this it follows that as the volatility of the magnetic characteristics in the active areas, to determine the "identity" tag you can also use a line space between adjacent active magnetic attitude areas. This label can be made in the form of linear matrix active magnetic attitude areas, or may have two or more linear arrays. They can be located mutual is about parallel or mutually orthogonal or any required geometric way. The size of an elementary line of the label depends on the length of individual elements, their separation from each other and the number of information bits. The minimum length of individual elements according to /4/that you can use, is of the order of several millimeters. One of the disadvantages of this encoding is that the authentication result for the same label may vary depending on the orientation of the label relative to the direction of its movement.

For a survey of the known device is used for authentication of the device containing the coils to create a magnetic field. For each of the coils passes a constant current with a superimposed alternating current with a smaller amplitude than permanent. For example, the value of DC current may be about 3, Whereas the magnitude of the alternating current about 50 mA. The frequency of the alternating current is quite high and amounts to about 2 kHz.

The disadvantages of the proposed device for identification and method of the survey are, in addition, the presence of the orientation of the identifiable label relative peremagnichivanie field, when its activation is not possible (for example, when the direction of magnetization reversal perpendicular to the direction peremagnichivanie field, as in this case, the magnetization reversal marks requires the I magnetic field with infinite amplitude), low immunity when using coils alternating magnetization, perpendicular to the direction peremagnichivanie field with a constant magnetic field (since the alternating magnetization of the label during its movement relative to paramagnetically coil will occur only once), as well as a weak signal, which emits a means of identification when it is polling. In addition, the survey such labels can only be done with small distances comparable to the spacing between the active magnetic fields.

The inventive device for identification and method of the survey is aimed at strengthening the emitted when the polling signal, increase the information capacity of your device and expand the scope of identification devices by providing opportunities explode in space identification devices and tools for survey and registration of the emitted signal at large distances from each other, as well as to improve the reliability of its operation, improving manufacturability and reducing the cost of manufacture.

This result is achieved in that the device for identification contains sited code elements, characterized by different coercive force in an external magnetic field in a specified direction, each code element is designed and the soft-magnetic material, which through the non-magnetic layer are related are grouped together made of magnetic material of the same shape and size of a single domain with magnetization in the direction of the axis of easy magnetization of discrete elements, which have a higher coercive force than said soft-magnetic material.

This result is achieved by the fact that discrete elements of magnetic material in different code elements made from the same source material, but of different size, spacing, shape anisotropy, the orientation of the axis of easy magnetization, the coercive force and the number they contain magnetic material.

This result is achieved by the fact that discrete elements of magnetic material in each code element is made of two identical groups, and the axis of easy magnetization in each group parallel to each other and positioned at an angle from 45 to 90° in relation to the axes of easy magnetizing the other group.

This result is achieved by the fact that the code elements with the same coercive force is made different by area.

This result is achieved by the fact that the ratio of the total area of the aggregate of discrete elements in the code element to plaadikuhjadega underneath a layer of soft-magnetic material is 0.001 to 0.9.

This result is achieved by the fact that one of the code elements with an area larger than each of the other forming part of the device.

This result is achieved by the fact that the soft-magnetic material that magnetically connected grouped together the same shape and size of the discrete elements made in the form of a layer thickness of 10-500 nm.

This result is achieved by the discrete elements of magnetic material is made thick, a component is 0.1 to 5.0 on the thickness of the soft-magnetic material.

This result is achieved in that the scanning method of the device for identifying objects includes sequential switching of magnetization by an external field in a specified direction code elements with different coercive force, the registration of the resulting electromagnetic pulses and their treatment, with each code element is made of grouped together the same shape and size of a single domain with magnetization in the direction of the axis of easy magnetization of discrete elements of magnetic material with a coercive force greater than the magnetic associated through non-magnetic layer of magnetically soft material, and the magnetization reversal using alternating magnetic fields with different rate of change in time is I.

This result is achieved by the fact that the discrete elements in the different code elements are different in size, anisotropy, shape, spacing, orientation of the axis of easy magnetization, the coercive force and the number they contain magnetic material.

This result is achieved by the fact that the discrete elements in each code element is made of two identical groups, with the easy axis magnetising in each group parallel to each other and positioned at an angle from 45 to 90° in relation to the axes of easy magnetizing the other group.

This result is achieved by the fact that the soft-magnetic material that magnetically connected discrete elements are in the form of a layer thickness of 10-500 nm.

This result is achieved by the discrete elements are thick, component, 0.1 to 5.0 on the thickness of the soft-magnetic material.

This result is achieved by the fact that the code elements peremagnichivanii using three sources of external magnetic field, the vectors of the magnetic fields which are located in mutually orthogonal directions, while the sources of the external magnetic field are placed sequentially along the direction of movement of the device for identification.

This result is achieved by the fact that the code elements peremagnichivanii, using three pairs of external magnetic field, the vectors of the magnetic fields which pairs are arranged in mutually orthogonal planes, each pair of the magnetic field vectors are to each other under an angle of 45-90°and the sources of the external magnetic field are placed sequentially along the direction of movement of the device for identification.

Implemented in the most General form of the device for identification may be a substrate on which are placed the code elements that emit electromagnetic pulse sequence, magnetization switching of an external field. Each individual code element in the most General case is a grouped on a platform of equal shape and size of single-domain discrete elements of magnetic material, a fragment (or layer) of soft-magnetic material and placed between the discrete elements and the soft-magnetic material, a nonmagnetic layer.

Under a single domain elements in the framework of this proposal are such that, when magnetized along the axis of easy magnetization are single domain.

The coercive force of true single-domain discrete elements strongly depends on the anisotropy of the form of discrete elements (see, for example, in the book. DIY. Magnetic materials, 1991, 384 C.). is, however, a single domain of discrete elements remain only at small scales (fractions of a micron or less). Almost as important to produce discrete elements of micron size, which are not truly single domain. Magnetic properties (in particular, the coercive force) multi-domain discrete elements is almost not regulated by the size and shape of the discrete elements. The specific scope of this regulation to be determined experimentally. We were able to set limits on the sizes of discrete elements, which, not being a single domain in the initial state, in the magnetized condition along the axis of easy magnetization get properties of single-domain discrete elements, i.e. they are pseudoanabaena. In this range of sizes of their coercive force begins to depend not only on the coefficient of anisotropy of the shape, but also on their size.

Figure 9. the above obtained using atomic force microscope topographic (a) and magnetic force (b) image of cobalt discrete magnetic elements of size 2×12 μm2directly after receiving their irradiation of cobalt oxide without magnetization. It is well visible that the data is discrete elements in ramanichandran state are multi-domain.

These discrete magnetic elements were investigated after magnetization in an external magnetic field along and across their long side. Figure 10 show the but in both cases, after magnetization, they become a single domain.

By increasing the size of the discrete elements (size 10×50 μm2they acquire a multi-domain magnetic structure during magnetization along the long sides of discrete elements (figa, and when the magnetization along the short sides of discrete elements (figb).

For such discrete elements (size 10×50 μm2), but created on the soft-magnetic sublayer cobalt, obtained magnetic force image differed significantly from similar images of discrete elements without sublayer. So, when the magnetization of discrete elements along the long direction (along the axis of easy magnetization) is observed for single contrast - single bits (figa) is the magnetization along the long sides of discrete elements (i.e. along the axis of easy magnetization), b) Magnetisation along the short sides of discrete elements). Magnetic force image in this case shows that each of the discrete elements has two distinct poles, no multi-domain structure within the discrete elements is not observed, i.e. they are single domain (figa), and when the magnetization across the long direction of the discrete elements of the observed contrast is bright expression is ing a multi-domain structure (figb).

Thus, it is shown that the presence of soft-magnetic underlayer stabilizes pseudoanabaena structure along the axis of easy magnetization of the magnetic discrete elements and allows, along with the shape anisotropy and sizes vary widely, and their characteristic values of the coercive force.

When implementing a device suitable these two layers of magnetic materials to separate a thin layer of non-magnetic material. This is because direct contact of discrete single-domain elements with multi-domain soft-magnetic layer may lead to the disappearance of the single-domain particle size in the discrete and the loss of previously inherent properties.

While there are various options of the individual elements included in the device identification, and a different order of their placement relative to each other. For example, the substrate can be placed discrete fragments of soft-magnetic material, over the same square layer of a nonmagnetic material, and the strips of discrete elements. Alternatively, when the substrate can be applied discrete elements over the substrate can be applied discrete elements on top of them fragments of non-magnetic material covering each selected (i.e. a subset of the one code what about the item) a group of discrete elements, and on top of the nonmagnetic layer fragments of soft-magnetic material.

In some cases the implementation to simplify manufacturing techniques, it is advisable to perform a layer of non-magnetic solid material, for example, by the methods of magnetron sputtering. In this case, the areas of soft-magnetic material will be covered with a layer of non-magnetic material and, in those areas, which are areas with a soft-magnetic material, can be put together single-domain discrete elements.

In another case, it is expedient from the point of view of simplifying the technology, to perform the layer of magnetically soft material is solid, and on top of it to put lots of nonmagnetic material located on them discrete elements.

The most preferable from the point of view of manufacturing technology identification devices seems to be the option, when the substrate is applied with a continuous layer of soft-magnetic material, on top of it a layer of nonmagnetic material, and then this layer by the method of selective removal of atoms by irradiation through a mask formed single-domain discrete elements with maintaining non-magnetic layer between them and the soft-magnetic material.

Alternatively, another implementation of the device to identify when the first substrate causing the Xia single-domain discrete elements, covered by a continuous layer of non-magnetic material, and then on the non-magnetic material is a continuous layer of soft-magnetic material.

Execution of code elements, characterized by different coercive force of one magnetic material due to the use of grouped together the same (within each code element) shape, size and distance between them is a single domain of discrete elements, allows you to create multi-bit (multi-bit or documents) information and protective label from one of the magnetic material through the use of a different code elements of the sets of single-domain discrete elements, by variation of the following parameters in their manufacture, leading to change their coercive force: the anisotropy of the shape, size of the discrete elements and the distances between them. In addition, if the formation of the discrete element method is used for selective removal of atoms - irradiation with a stream of accelerated particles (see EN 2129320, EN 2169398, EN 2227938, EN 2243613), then ceteris paribus change in the radiation dose allows change of the coercive force and thus increase the information capacity of created labels. The author experimentally found that, in contrast to the previously used multi-domain discrete ele is having pseudoanabaena discrete elements coercive force depends on the anisotropy of shapes and sizes and, as a rule, exceeds the coercive force of the soft-magnetic underlayer deposited from the same material. This, in turn, allows you to create from the same material multiple labels, each of which contains its own unique combination of code elements. However, in the case of binary encoding multi-bit (multi-bit) tag containing 64 or 96 of the code elements can produce a 264and 296unique labels, respectively.

You can use not only binary, but also more complex systems of encoding multi-bit labels, for example, ternary, decimal, etc. When using such systems encode each code element is made from one of three (or ten) of discrete values of its area. Accordingly, each value of the area code of the item, even if they have the same coercive force, responding to the typical value of the amplitude of the emitted them the magnetization switching signal, since ceteris paribus, the amplitude of the emitted signal is proportional to the amount of magnetic material contained in the code element.

Consistent placement of the layers in the labels of the words is, containing aggregate pseudoanabaena discrete elements, a layer of soft-magnetic material and a layer of nonmagnetic material between them - it is necessary to provide some functional information and safety labels.

In addition, using a combination of discrete pseudoanabaena elements to form code elements labels allows to realize high speed of magnetization reversal in comparison with the multi-domain code elements due to the smaller variation in magnetic properties between different pseudoanabaena elements in the specified population (taking into account the similarity of their shape and size). This circumstance, as it was installed, increasing the intensity of the electromagnetic pulse emitted code element when the magnetization reversal of its external field.

In the code element is formed only by a set of discrete pseudoanabaena elements filled with a magnetic material only part of its area. It is not possible to fully utilize the entire area of the code element to achieve the maximum intensity of the electromagnetic pulse emitted code element of the magnetization switching of the components of its discrete elements of the external field. The area code of the item can be fully used if above (isopod) layer, containing discrete elements, place a layer of magnetically soft material (material with a noticeably smaller coercive force than pseudoanabaena elements). In this case, when optimally selected ratio of the thicknesses of discrete elements and a layer of magnetically soft material, and when a specific image is selected distances between discrete elements of their magnetic interaction, it is possible to achieve such a result that the entire material of the magnetically soft layer within the code element will be paramagnetically only simultaneously with a set of discrete elements that make it up. This achieves two important practical result. First, the coercive force of the code element is intermediate between the coercive force of the soft-magnetic layer and the coercive force placed on it (under it) aggregate more magnetic hard discrete elements forming the code element. This coercive force is greater than the higher values of the coercive force of the discrete magnetic elements. In addition, various code elements having a common sublayer, behave independently of the magnetization switching of the external magnetic field that allows you to use the proposed method of manufacture for producing a multi-bit AMID tags secondly, while magnetization reversal of soft-magnetic underlayer and the discrete magnetic elements observed a significant increase in the intensity of the emitted code element signal is about 100-200 times or more compared with the signal emitted by the magnetization switching of the same discrete magnetic elements in the absence of soft-magnetic layer. However, direct contact of discrete elements with a multi-domain soft-magnetic layer may lead to the extinction of pseudodementia in discrete elements and the loss of previously inherent properties. To avoid this, the two layers of magnetic materials most appropriate to share with a thin layer of non-magnetic material.

Thus, it is experimentally shown that the presence of two layers of magnetic material makes it possible to increase the amplitude of the signal emitted when the magnetization reversal of such "sandwich" (compared to similar single-layer code element without soft-magnetic underlayer is 100-200 times the effect of magnetic amplification"). The latter, in turn, leads to an increase in long-range reading of such multi-layer labels. In this multilayer system response moment magnetically soft underlayer occurs when the large amplitude, the higher Corsicana force placed on its discrete elements. The effect magni the aqueous gain" due to several reasons: increased magnetic interaction between discrete pseudoanabaena elements through the soft-magnetic layer (and, therefore, more simultaneous and fast the magnetization reversal); acceleration of the magnetization reversal of soft-magnetic layer, as his pace will be determined by the rate of magnetization reversal together pseudoanabaena discrete elements; a large amount of magnetic material contained in such code elements.

The performance of each code element of the two groups are the same discrete elements, the axis of easy magnetizing which are located at a 45-90°allows to increase the probability of interviewing receiving electromagnetic pulse with an amplitude sufficient for registration from a separate code element and the label in General, at large angles (in the range of 45-90 degrees) of the pivot axis of easy magnetization pseudoanabaena discrete element relative to the direction peremagnichivanie field.

The execution layer of soft-magnetic material of a thickness of 10-500 nm allows to increase an electromagnetic pulse that occurs when the magnetization switching of an external field code elements. If the layer of magnetically soft material to perform less than 10 nm, the amplification of electromagnetic pulse that occurs when the magnetization switching of an external field code elements, practically not observed. The increase of the layer thickness of more than 500 nm is impractical, because the result in a strong reduction of the influence of discrete pseudoanabaena elements on the coercive force of the code elements, because of their impact on more distant from them layers of soft-magnetic layer has practically no effect.

Performing discrete pseudoanabaena elements of magnetic material thickness, component, 0.1 to 5.0 on the thickness of the soft-magnetic layer, ensures their effective impact on the coercive force of the code elements and to provide sufficient amplification of electromagnetic pulse that accompanies the switching of magnetization of discrete elements forming part of code elements. If this ratio is less than 0.1, the coercive force of the code element as a whole is not different from the coercive force contained in a layer of soft-magnetic material. If this ratio is more than 5.0, as determined empirically, amplification of electromagnetic pulse that accompanies the alternating magnetization of the code elements is reduced.

In private sales, it is advisable to produce a device for identification so that the ratio of the total area of the aggregate of discrete elements in the code element to the area underneath a layer of soft-magnetic material constituted of 0.001 to 0.9.

Manufacturer code elements, in which the ratio of the area of the aggregate of discrete elements to the area of the soft-magnetic layer is 0.001 to 0.9, due to the prohibited topics when the values of the ratio, the smaller of 0.001, the effect of pseudoanabaena discrete elements on the soft-magnetic layer does not cover the entire area of this layer. This leads to a significant decrease in the intensity of the electromagnetic pulse emitted code element when the magnetization reversal, as well as to the appearance of additional impulse from the soft-magnetic layer. If this ratio is higher than 0.9, there are technical difficulties in manufacturing the aggregate single-domain discrete elements, because the distances between them become too small, and this may lead to uncontrolled merging of separate discrete elements and unacceptable change in the magnetic properties of the corresponding code element.

The amplitude of the pulses emitted by the code elements in the magnetization reversal in an external alternating magnetic field, depends upon other equal conditions the speed of its change in time. So when you change the amplitude of the magnetic field at a constant frequency, the amplitude of the emitted pulses is increased proportionally to the change in the amplitude of the external magnetic field, and the duration of the emitted pulses is reduced accordingly. Similarly, the influence on the characteristics of the emitted code elements of the pulse frequency changes in the external magnetic floor is (at constant amplitude). This fact is used to increase the amplitude of the pulses when reading code elements and, thus, to increase the distance at which the code elements can be read.

Therefore, in certain cases, the implementation of the proposed method, it is possible that the magnetization switching of code elements change only the amplitude peremagnichivanie fields or change only the frequency peremagnichivanie fields or change and the frequency and amplitude peremagnichivanie field.

Use for alternating magnetization of the code elements of the three sources of external magnetic fields with mutually orthogonal directions they create magnetic fields arranged in series along the direction of movement of the labels, allows to exclude non-operation labels on the device to identify due to the unfavorable orientation of the code elements relative to the direction peremagnichivanie fields, especially in the case of use in the labels of the dual code elements, the axis of easy magnetizing which are located at a 45-90°.

Use for alternating magnetization of the code elements of the three pairs of external magnetic field, the vectors of the magnetic fields which pairs are arranged in mutually orthogonal planes at angles of misorientation of the magnetic fields in each of the Arab Republic of Egypt magnetic fields 45-90° arranged in series along the direction of movement of the labels, allows to exclude non-operation labels on the device to identify due to the unfavorable orientation of the code elements relative to the direction peremagnichivanie field even in the case of single (nesvorny) code elements.

The essence of the claimed device for identification and method of the survey are illustrated by the examples of their implementation and drawings.

Figure 1-5 shows schematically various embodiments of the devices to identify covered by the first paragraph of formula (top view and cross-sections); figure 5 shows the most technologically advanced for the implementation of the device for identification; figure 6 shows a top view of the device for identification in a variant implementation, when single-domain discrete elements of magnetic material in each code element is made of two identical groups, and the axis of easy magnetization of one group are arranged at an angle relative to the axes of easy magnetizing the other group; figure 7 and 8 schematically presents variants of the basic scheme of the device to implement the method of the survey claimed identification devices; Fig.9-12 presents images illustrating the creation of a single domain in a magnetized state of a discrete e is the elements.

Example 1. In one of the common cases, the device for identification (figure 1) includes a substrate 1, on which is placed the code elements, each of which represents a portion of a layer of soft-magnetic material 2, on top of which is placed together discrete single domain elements 3, characterized by different coercive force. Between discrete elements 3 and the soft-magnetic material 2 is placed a layer 4 of non-magnetic material. As a soft-magnetic material can be used nanocrystalline cobalt, iron, Nickel, alloys of type iron-Nickel, iron-cobalt, permalloy, and some others. As the magnetic material with a coercive force greater than that of the aforementioned soft-magnetic material, can be used together single-domain discrete elements of nanocrystalline cobalt, iron, Nickel, alloys of type iron-Nickel, iron-cobalt, permalloy and some others. In spite of that here are the same materials used for the manufacture of discrete items and the soft-magnetic layer, every time you need to choose a couple of materials so that the material that goes in the manufacture of discrete items, would have a greater coercive force than used as a soft-magnetic. The substrate can be the used plate or film of non-magnetic materials, for example, silicon, polyester, polyimide, paper, and some others, and as a non-magnetic material it is possible to use silicon oxide, cobalt oxide and other

Example 2. In another common scenario, the device for identification (figure 2) includes a substrate 1, on which is placed the code elements, each of which is the aggregate of discrete single-domain elements 3, characterized by different coercive force, over which is placed a layer of soft-magnetic material 2, and between discrete elements 3 and the soft-magnetic material 2 is placed a layer 4 of non-magnetic material. As a soft-magnetic material can be used nanocrystalline cobalt, iron, Nickel, alloys of type iron-Nickel, iron-cobalt, permalloy, and some others. As the magnetic material with a coercive force greater than that of the aforementioned soft-magnetic material, can be used together single-domain discrete elements of nanocrystalline cobalt, iron, Nickel, alloys of type iron-Nickel, permalloy. In spite of that here are the same materials used for the manufacture of discrete items and the soft-magnetic layer, every time you need to choose a couple of materials so that the material that goes in the manufacture of discrete items, the possession is greater coercive force, than used as a soft-magnetic. The substrate can be used wafer silicon, polyester, polyimide, paper, and some others, and as a non-magnetic material it is possible to use silicon oxide, cobalt oxide and other

Example 3. In yet another variant of realization of the device for identification (figure 3) includes a substrate 1, on which is placed a continuous layer of soft-magnetic material 2, and the aggregate single-domain discrete elements 3, characterized by different coercive force. Between discrete elements 3 and the soft-magnetic material 2 is placed a layer 4 of non-magnetic material. As materials for the manufacture of identification devices can be used in the preceding examples.

Example 4. In another case, the implementation of the device for identification (figure 4) includes a substrate 1, on which is placed the fragments (discrete parts) layer of soft-magnetic material 2, over which is placed a continuous layer of non-magnetic material 4, and on it over the areas of soft-magnetic material is placed together discrete single domain elements 3, characterized by different coercive force. As materials for the manufacture of identification devices can be used in the preceding examples.

When is EP 5. In yet another implementation, the most technologically advanced device for identification (figure 5) contains a substrate 1, on which is placed a continuous layer of soft-magnetic material 2, over which is placed a continuous layer of non-magnetic material 4, and the aggregate single-domain discrete elements 3, characterized by different coercive force.

Possible other embodiments of the device for various interleaving mentioned, now solid layers and discrete elements. In particular, can be accommodated on a substrate of discrete elements, and over them a continuous layer of nonmagnetic material, over which is applied a layer of soft-magnetic material, etc.

As materials for the manufacture of identification devices can be used in the preceding examples.

Example 6. Another special case of the implementation of the device for identification (6) includes a substrate 1, on which is placed a continuous layer of soft-magnetic material 2, over which is placed a continuous layer of non-magnetic material 4, and the aggregate single-domain discrete elements 3, characterized by different coercive force. This pseudoanabaena discrete elements of magnetic material in each code element is made of two identical groups,the easy axis magnetising in each group parallel to each other and set at an angle of 45-90° with respect to the axes of easy magnetization of the other group. This angle may vary within the limits specified in the claims.

The changes in the anisotropy of the shape and size of single-domain elements in different sets allow for widely modify their inherent coercive force.

Example 7. To implement the proposed method survey of the proposed identification devices may be used the known device described in /4/ or presented on Fig.7. The device to be polled in the most General case can contain a Helmholtz coil 5, performs the function peremagnichivanie block. This coil is supplied from the generator depending on the operating conditions of an alternating electric current of high or low frequency f. To ensure reliable detection of the desired identification devices (tags) it is advisable to install three paramagnetically unit that generates a magnetic field vectors are oriented in three mutually perpendicular directions, as shown in the drawing. Device for the survey contains a receiving antenna 6 connected to the signal processing unit 7. For detection and identification labels (device identification) use the second harmonic peremagnichivanie current with a frequency of 2f. To suppress signals is astute f uses a low-pass filter, which is supplied to the signal processing unit 7, which contains an analog-to-digital Converter (ADC) and digital signal processor. These elements and, in particular, the digital signal processor provide the intended application of the device of the survey. The nature of the signal processing and the means through which it runs, are widely known and are not described in detail here, as it is not related to the merits of inventions.

The proposed method is implemented using the above described device is as follows. The conveyor 8 moves any object 9 that contains a label (device identification) and passes through the device polling, where exposed to low-frequency or high-frequency fields generated by the coil (or coils) Helmholtz. Under the action of magnetic fields code elements sequentially in time paramagnetically - as their coercive force. Their alternating magnetization will occur with a frequency of 2f as long as they are within range of an alternating magnetic field of sufficient amplitude. In order to avoid problems that can occur when the partial magnetization reversal code elements identified in the label, when it gets to the area with insufficient amplitude of the magnetic field in each of edu enter reference code element with the maximum among them the coercive force and the amplitude of the emitted signal (at the expense of increasing its area compared to other code elements). Signal processor automatically cuts off those sequences that do not contain the signal from the reference code element.

Example 8. To implement the proposed method survey of the proposed identification devices can be used for another device, similar to that described in /4/ or presented on Fig. Device for polling may also contain a Helmholtz coil 5, performs the function peremagnichivanie block. This coil is supplied from the generator depending on the operating conditions of an alternating electric current of high or low frequency f. To provide more reliable detection of the desired identification devices (tags) it is advisable to install three pairs paramagnetically blocks, creating a magnetic field vectors of the magnetic fields which pairs are arranged in mutually orthogonal planes. For ease of reference, drawing on the scheme (Fig) image sources external magnetic field is presented in the form of a historic double-ended arrows, coinciding with the directions of the vectors created their fields. For example, the letters "a", "b" and "C" denotes the arrows that correspond to the sources of the external magnetic field vectors which are mutually orthogonal directions, as it was shown earlier in Fig.7. In this case, to have the amount of external fields added three more (they are marked on the drawing as "a 1"a, " " b1and with1"with the formation of three pairs, each of which lies in a respective plane and all planes orthogonal to each other. In each pair, the direction of magnetic fields on misoriented angles 45-90°. For example, the vectors "a" and "a1lie in the plane of the conveyor and misoriented each other at some angle. The vectors b and b1" are located in the plane perpendicular to the conveyor and the direction of movement of the label and the vectors C and1" are located in the plane perpendicular to the pipeline, but parallel to the direction of movement of the label. Device for the survey contains a receiving antenna 6 connected to the signal processing unit 7. For detection and identification labels (device identification) use the second harmonic peremagnichivanie current with a frequency of 2f. To suppress signals at the frequency f used a low pass filter, which is supplied to the signal processing unit 7, which contains an analog-to-digital Converter (ADC) and digital signal processor. These elements and, in particular, the digital signal processor provide the intended application of the device of the survey. The nature of the signal processing and the means through which it runs, are widely known and are not described in detail here, as it is not related to the merits invented the th.

Further, the method is implemented as described in example 7.

Example 9. Device for identification contained substrate 1 of silicon of a thickness of 0.45 mm and an area of 2 cm2. The substrate was coated with the layer of soft-magnetic material 2 thickness of 100 nm and an area of 2 cm2made of nanocrystalline cobalt. On top of it is placed a layer of non-magnetic material 4 from cobalt oxide thickness of 50 nm, and the layer containing the aggregate of discrete single-domain elements 3 with a thickness of 30 nm made of nanocrystalline cobalt, characterized by different coercive force and consisting of grouped together the same shape and size pseudoanabaena discrete elements of magnetic material with a coercive force greater than that mentioned layer of soft-magnetic material 2. The magnitude of the coercive force of the code elements ranged from 25 to 75 OE. These differences were accounted for by the fact that the set of discrete single-domain elements in each code element had a unique code element combination of size, shape anisotropy and orientation of the axis of easy magnetization (see figure 1).

The minimum size of the discrete elements ranged from one code element to another in the range of 5 to 30 μm and a maximum size of 5 to 60 μm, the shape anisotropy from 1 to 6. the AK, for example, discrete elements with a width of 5 μm could be up to 30 microns.

This device for identification was placed between two strips of paper, which, in turn, was passed through the above-described device for polling. For the magnetization reversal was used one source of the external field. The distance from the device to identify the source of the magnetic field up to 15 see the Impact on identifiable tag has accomplished an alternating magnetic field with a frequency of 50 Hz. The amplitude of peremagnichivanie field during the survey of the label was changed in the range from 60 to 240 E. To a recording device, located at a distance of 5 cm from the identifiable marks were recorded signals with an amplitude sufficient for reliable operation of the analog-to-digital Converter.

Example 10. Device for identification contained substrate 1 made of polyimide with a thickness of 100 μm and an area of 3 cm2. The substrate was coated with the layer of soft-magnetic material 2 thickness of 100 nm and an area of 3 cm2made of a nanocrystalline alloy of iron-Nickel. On top of it is placed a layer of non-magnetic material 4 made of silicon oxide with a thickness of 10 nm, and the layer containing the aggregate of discrete single-domain elements 3 of a thickness of 40 nm, made of nanocrystalline cobalt, characterized the students of different coercive force and consisting of grouped together the same shape and size of single-domain discrete elements of magnetic material with a coercive force more than the mentioned layer of soft-magnetic material 2. The magnitude of the coercive force of the code elements ranged from 30 to 50 OE. These differences were accounted for by the fact that the set of discrete single-domain elements in each code element was inherent only to this code element combination of size, shape anisotropy and orientation of the axis of easy magnetization (see figure 1).

The minimum size of the discrete elements ranged from one code element to another in the range of 5 to 50 μm and a maximum size of 5 to 60 μm, the shape anisotropy of 1 to 5. So, for example, discrete elements with a width of 5 μm could be up to 25 microns.

This device for identification housed inside a plastic case, which, in turn, was passed through the device for his survey using three sources of external magnetic fields with mutually orthogonal directions they create magnetic fields. The distance from the identification devices to magnetic fields up to 10 see the Impact on identifiable tag has accomplished an alternating magnetic field with an amplitude of from 60 to 150 E. At this frequency peremagnichivanie field during the survey of the label was changed in the range from 50 to 218 Hz. To a recording device, located at a distance of 10 cm from Eden is efficieny labels, were recorded signals with an amplitude sufficient for reliable operation of the analog-to-digital Converter.

Example 11. Device for identification contained substrate 1 made of polyester with a thickness of 30 μm and an area of 3 cm2. The substrate coated with the layer of soft-magnetic material 2 thickness of 25 nm and an area of 3 cm2made of nanocrystalline cobalt. On top of it is placed a layer of non-magnetic material 4 made of silicon oxide thickness of 7 nm, and the layer containing the aggregate of discrete single-domain elements 3 of a thickness of 20 nm made of a nanocrystalline alloy of iron-cobalt, characterized by different coercive force and consisting of grouped together the same shape and size of single-domain discrete elements of magnetic material with a coercive force greater than that mentioned layer of soft-magnetic material 2. The magnitude of the coercive force of the code elements ranged from 75 to 200 OE. These differences were accounted for by the fact that the set of discrete single-domain elements in each code element was inherent only to this code element combination of size, shape anisotropy and orientation of the axis of easy magnetization (see figure 1).

The minimum size of the discrete elements ranged from one code element to another in the range from 1 to 10 μm, the maximum size from 6 to 60 μm, shape anisotropy from 1 to 6. So, for example, discrete elements with a width of 1 μm could be up to 6 ám.

This device for identification were placed inside plastic packaging with a fragment of tissue, which, in turn, was passed through the above-described device for the survey, using three sources of external magnetic fields with mutually orthogonal directions they create magnetic fields. The distance from the identification devices to magnetic fields up to 15 see the Impact on identifiable tag has accomplished an alternating magnetic field with a simultaneous change of its frequency and amplitude. The frequency is changed within 50-218 Hz, and the amplitude - 50-210 OE. To a recording device, located at a distance of 15 cm from the identifiable marks were recorded signals with an amplitude sufficient for reliable operation of the analog-to-digital Converter.

Example 12. Device for identification contained substrate 1 made of polyester with a thickness of 30 μm, covered with a film of aluminum with a thickness of 30 nm and an area of 4 cm2. The substrate was coated with the layer of soft-magnetic material 2 thickness of 10 nm and an area of 4 cm2made of nanocrystalline cobalt. On top of it is placed a layer of non-magnetic material 4 made of aluminum oxide with a thickness of 15 nm, and the em - the layer containing the aggregate discrete pseudoanabaena elements 3 of a thickness of 50 nm made of nanocrystalline Nickel, characterized by different coercive force and consisting of grouped together the same shape and size of single-domain discrete elements of magnetic material with a coercive force greater than that mentioned layer of soft-magnetic material 2. The magnitude of the coercive force of the code elements ranged from 40 to 85 OE. These differences were accounted for by the fact that the set of discrete single-domain elements in each code element was inherent only to this code element combination of size, shape anisotropy and orientation of the axis of easy magnetization (see figure 1).

The minimum size of the discrete elements ranged from one code element to another in the range from 0.5 to 2 μm and a maximum size of 3 to 12 μm, the shape anisotropy from 1 to 12. So, for example, discrete elements with a width of 0.5 μm could be up to 6 ám.

This device for identification was placed on the fragment of metal lids from cans, which, in turn, was passed through the above-described device for polling. The distance from the identification devices to magnetic fields up to 10 see the Impact on identificare the second label was carried out with an alternating magnetic field. The amplitude of the magnetic field was changed in the range of 50-250 OE. To a recording device, located at a distance of 10 cm from the identifiable marks were recorded signals with an amplitude sufficient for reliable operation of the analog-to-digital Converter.

Example 13. Device for identifying includes a substrate 1 made of special paper with a thickness of 100 μm and an area of 5 cm2. The substrate coated with the layer of soft-magnetic material 2 thickness of 60 nm and an area of 3 cm2made of nanocrystalline Nickel. On top of it is placed a layer of non-magnetic material 4 made of silicon oxide with a thickness of 10 nm, and the layer containing the aggregate of discrete single-domain elements 3 of a thickness of 25 nm, made of nanocrystalline iron, characterized by different coercive force and consisting of grouped together the same shape and size of single-domain discrete elements of magnetic material with a coercive force greater than that mentioned layer of soft-magnetic material 2. The magnitude of the coercive force of the code elements ranged from 60 to 160 OE. These differences were accounted for by the fact that the set of discrete single-domain elements in each code element was inherent only to this code element combination of size, shape anisotropy and orientation of the axis of Legkov the magnetization (see figure 1).

The minimum size of the discrete elements ranged from one code element to another in the range from 0.3 to 5 μm and a maximum size of 3 to 30 μm, the shape anisotropy from 1 to 6. So, for example, discrete elements with a width of 5 μm could be up to 30 microns.

This device for identification was placed on the surface of the ampoule with water, which, in turn, was passed through the above-described device for polling. The distance from the identification devices to magnetic fields up to 7 see the Impact on identifiable tag has accomplished an alternating magnetic field with a frequency of 50 Hz and an amplitude of 170 OE. To a recording device, located at a distance of 7 cm from the identifiable marks were recorded signals with an amplitude sufficient for reliable operation of the analog-to-digital Converter.

Example 14. Device for identification and method implemented, as described in example 12, but the differences were that the minimum size of the discrete elements ranged from one code element to another in the range of 5 to 10 μm and a maximum size of 30 to 60 μm, the shape anisotropy from 1 to 6. So, for example, discrete elements with a width of 5 μm could be up to 30 microns.

This device for identification housed inside polietilenovogo the package, which, in turn, was passed through the above-described device for polling. The distance from the identification devices to magnetic fields up to 8 see the Impact on identifiable tag was carried out by alternating low-frequency magnetic field with a frequency of 50 Hz and an amplitude of 170 OE. To a recording device, located at a distance of 8 cm from the identifiable marks were recorded signals with an amplitude sufficient for reliable operation of the analog-to-digital Converter.

1. Device for identification containing sited code elements, characterized by different coercive force in an external magnetic field in a specified direction, each code element is made of soft-magnetic material, through which the non-magnetic layer magnetically connected grouped together, made of magnetic material, identical in shape and size, a single domain with magnetization in the direction of the axis of easy magnetization of discrete elements, which have a higher coercive force than said soft-magnetic material.

2. The device according to claim 1, wherein the discrete elements of magnetic material in different code elements made from the same source material, but differ in RA the measures the distances between them, anisotropy, shape, orientation of the axis of easy magnetization, the coercive force and the number they contain magnetic material.

3. The device according to claim 1, wherein the discrete elements of magnetic material in each code element is made of two identical groups, with the easy axis magnetising in each group parallel to each other and positioned at an angle from 45 to 90° in relation to the axes of easy magnetizing the other group.

4. The device according to claim 1, wherein the code elements with the same coercive force is made different by area.

5. The device according to claim 1, characterized in that the ratio of the total area of the aggregate of discrete elements in the code element to the area underneath a layer of soft-magnetic material is 0.001 to 0.9.

6. The device according to claim 1, characterized in that one of the code elements with an area larger than each of the other forming part of the device.

7. The device according to claim 1, characterized in that the soft-magnetic material that magnetically connected grouped together the same shape and size of the discrete elements made in the form of a layer thickness of 10-500 nm.

8. The device according to claim 1, characterized in that the discrete elements of magnetic material is made thick, part 0,-5,0 thicknesses of soft-magnetic material.

9. The method of polling the device for identifying objects, including sequential switching of magnetization by an external field in a specified direction code elements with different coercive force, the registration of the resulting electromagnetic pulses and their treatment, with each code element is made of grouped together, the same form and size, a single domain with magnetization in the direction of the axis of easy magnetization of discrete elements of magnetic material with a coercive force greater than the magnetic associated through non-magnetic layer of magnetically soft material, and the magnetization reversal using alternating magnetic fields with different speed change them in time.

10. The method according to claim 9, wherein the discrete elements in the different code elements are different in size, anisotropy, shape, spacing, orientation of the axis of easy magnetization, the coercive force and the number they contain magnetic material.

11. The method according to claim 9, wherein the discrete elements in each code element is made of two identical groups, with the easy axis magnetising in each group parallel to each other and positioned at an angle from 45 to 90° in relation to the axes of easy magnetizing the other group.

1. The method according to claim 9, characterized in that the soft-magnetic material that magnetically connected discrete elements are in the form of a layer thickness of 10-500 nm.

13. The method according to claim 9, characterized in that the discrete elements are thick, component, 0.1 to 5.0 thicknesses of soft-magnetic material.

14. The method according to claim 9, wherein the code elements peremagnichivanii using three sources of external magnetic field, the vectors of the magnetic fields which are located in mutually orthogonal directions, while the sources of the external magnetic field are placed sequentially along the direction of movement of the device for identification.

15. The method according to claim 9, wherein the code elements peremagnichivanii using three pairs of external magnetic field, the vectors of the magnetic fields which pairs are arranged in mutually orthogonal planes, each pair of the magnetic field vectors are to each other under an angle of 45-90°and the sources of the external magnetic field are placed sequentially along the direction of movement of the device for identification.



 

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