Magnetoresistive gradiometer head. RU patent 2506665.
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 Magnetoresistive converter / 2483393Converter comprises a substrate with a dielectric layer, on which there are four parallel arranged thin-film magnetoresistive strips connected into a bridge circuit, and each strip comprises upper and lower protective layers, between which there are two ferromagnetic films with a separating layer between them. The first insulating layer is arranged above magnetoresistive strips. On the surface of the first insulating layer there are four nanomagnets in the form of rectangular strips arranged along thin-film magnetoresistive strips. Each nanomagnet comprises an auxiliary layer of chrome with a hard-magnetic film applied above it and a protective layer. Coercive force of the hard-magnetic film is at least three times higher than the field of magnetic anisotropy of a ferromagnetic film. Nanomagnets are arranged with a distance equal to width of the nanomagnet strip. The period of nanomagnet repetition is equal to doubled period of repetition of thin-film magnetoresistive strips. The magnetic field created by nanomagnets in neighbouring arms of the bridge circuit is directed as antiparallel. The neighbouring magnetoresistive strips are in minima of positive and negative permanent field of nanomagnets. |
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 Magnetoresistive gradiometer transducer / 2453949Invention can be used in tachometers, nondestructive inspection devices, displacement sensors, sensors for measuring constant and variable magnetic fields, electric current and biosensors. The magnetoresistive gradiometer transducer has a substrate with a dielectric layer on which there are thin-film magnetoresistive strips connected by nonmagnetic low-resistance connecting links into a bridge circuit, each strip having a top and a bottom protective layer with a ferromagnetic film in between. There is an insulating layer on top of the thin-film magnetoresistive strips. The thin-film magnetoresistive strips in the first and fourth arms of the bridge circuit lie perpendicular to the thin-film magnetoresistive strips of the second and third arms of the bridge circuit, wherein the first and second arms of the bridge circuit lie from the third and fourth arms of the bridge circuit at a distance not less than twice the length of the thin-film magnetoresistive strip. |
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FIELD: physics.
SUBSTANCE: invention relates to magnetic nanoelements. Magnetoresistive gradiometer head has a substrate with a dielectric layer on which there are four rows of thin-film magnetoresistive strips connected in series by low-resistance jumpers in each arm of a bridge circuit, said rows being connected into a bridge circuit by said jumpers, each of said strips having top and bottom protective layers with a ferromagnetic film in between, a first insulating layer on top of the thin-film magnetoresistive strips, on which is formed a first planar conductor with working parts, arranged over the thin-film magnetoresistive strips and a second insulating layer, a second planar conductor passing over and along the working thin-film magnetoresistive strip and a protective layer, wherein all thin-film magnetoresistive strips lie in one row, in all thin-film magnetoresistive strips the easy magnetisation axis of the ferromagnetic film is directed at an angle of 45° relative the longitudinal axis of the thin-film magnetoresistive strip, and the working arm of the bridge circuit closest to the edge of the gradiometre head is far from the three ballast arms of the bridge circuit, the width of the ballast thin-film magnetoresistive strip is N times smaller than the width of the working thin-film magnetoresistive strip, and the ballast row of the bridge circuit consists of a set of N parallel-connected thin-film magnetoresistive strips.
EFFECT: invention weakens the local magnetic field acting on a magnetoresistive gradiometer head and increases sensitivity.
2 cl, 3 dwg
The invention relates to the field of magnetic on the basis of multilayer metal nanostructures with effect and can be used in sensors, magnetic field and current heads of reading from magnetic disks and tapes, devices of diagnostics of printed circuit boards and chips, bioobjects (bacteria, viruses, toxins and DNA)identification of the information recorded on magnetic tape, read the information recorded magnetic ink.
Known head-gradiometer (Kasatkin SR, Ants A.M. head-gradiometer. Patent of Russian Federation №2366038). In this head- linear volt- response () is formed by a magnetic field generated by a current in the conductor control, located above the thin film stripes. The disadvantage of this device is large enough current in the conductor control, reaching tens of mA, which limits the use of lines and matrices of such magnetoresistive heads-.
Known head-gradiometer (Kasatkin SR, Ants A.M. head-gradiometer. Patent of Russian Federation №2403652). In this head- linear formed location of easy magnetization axis () ferromagnetic film angle of 45-degree relative length of a thin-film strips. The disadvantage of this device is the same sensitivity to the magnetic field working and three ballast magnetoresistive strips, and it will require a significant removal of each other to get high weakening of the influence of local magnetic field on head-gradiometer.
Challenge posed and solved by this invention is to create head- on the basis of a metal ferromagnetic nanostructures with the occurrence of a planar touch current with linear .
The technical result is expressed in the provision of compact size, the weakening of acting head-gradiometer local magnetic field, increase the sensitivity.
This technical result is achieved by the valves- containing substrate with dielectric layer on which are located in the United bridge circuit nonmagnetic jumpers four of a number of series-connected same jumpers in each arm of the bridge circuit magnetoresistive thin-film strips, each containing the upper and lower layers, between which is a ferromagnetic film, the first insulating layer on top of the magnetoresistive thin-film strips, which formed the first planar conductor with working parts, located above the thin film stripes, and second, the insulation layer, the second planar Explorer, going over and along the work thin-film strips, and a protective layer, all magnetoresistive thin-film strips are one, all magnetoresistive thin-film strips ferromagnetic film is directed at the angle of 45 degrees relative to the longitudinal axis of a thin-film bar and the operating leverage of the bridge circuit, the closest to the edge of the head-, removed from three ballast shoulders of the bridge circuit, width ballast thin-film strips N times smaller than the width of the working thin-film strips and ballast number of the bridge circuit consists of a set of N parallel United magnetoresistive thin-film strips. Ballast magnetoresistive thin-film strips can be placed along ferromagnetic film, and their length is determined by the equation of resistance of the working thin-film strips and a set of N parallel United ballast magnetoresistive thin-film strips.
The essence of the proposed technical solution consists in that the thin film strip with reduced to N times the width is approximately N times less sensitive to the magnetic field of an increase in the demagnetization of magnetic field. Thus, do not need to remove the ballast magnetoresistive thin-film strips from working magnetoresistive thin-film strips considerable distance attenuation measured near-surface magnetic field. At the same time it increases the sensitivity head- due to the increase in the weakening of the local magnetic field acting on the head-gradiometer.
The invention is illustrated by drawings: figure 1 presents head-gradiometer with ferromagnetic film in thin-film strip in a section; figure 2 shows the structure of head-, top view figure 3 shows the waveform of the experimental head-.
head-gradiometer contains substrate 1 (figure 1) with the dielectric layer 2, magnetoresistive thin-film strips containing bottom 3, and the upper protective 4 layers, between which is a ferromagnetic film 5. On top of magnetoresistive thin-film strips is the first insulating layer 6, which formed the first planar Explorer 7 with working part, above the thin film stripes along them. Above are the second insulating layer 8, the second planar Explorer 9, passing over of the working thin-film strips along it, and a protective layer 10.
Structurally head-gradiometer consists of four shoulder 11-14 (figure 2) bridge circuit, one of which 11 - operating leverage from one thin film strips, and three ballast shoulder 12-14. Operating leverage 11 is near the edge head-, and three ballast shoulder 12-14 removed from the working shoulder 11. Operating leverage 11 contains one strip, and the ballast shoulders 12-14 contain four parallel connected magnetoresistive thin-film strips with the width, four times less width of the working thin-film strips. Magnetoresistive thin-film strips in the shoulders 11-14 connected in parallel nonmagnetic jumpers 15. Over the thin film stripes shoulders 11-14 is the first planar Explorer 16. The working shoulder stripe 11 formed the second planar Explorer 17, passing along it.
Work head- is as follows. In magnetoresistive thin-film strips 11-14 head- served permanent touch to read the current signal. In the second planar Explorer 17 powered by direct current to the desired polarity to achieve maximum sensitivity head- due to the inclination of the magnetization vector working thin-film strips at the optimum angle at a 45-degree relative to its length. In the first planar Explorer 16 serves a pair of pulses of a current set/reset the opposite polarity to eliminate the effect of hysteresis to the results of measurements of the magnetic field. Current pulses must be of sufficient magnitude (usually about 1-2 (A)to all magnetoresistive thin-film strips 11-14 create the same magnetic state, and this is achieved by adjusting the effect of hysteresis to the results of measurements of the magnetic field.
Before the measurement vectors of the magnetization of the ferromagnetic film 5 in magnetoresistive thin-film strips shoulders 11-14 should be directed along its deployed approximately 45 degrees from the axis of the length of a thin-film strips. But due to the influence of the demagnetization of magnetic field created by the component vectors of the magnetization of the ferromagnetic film 5 perpendicular to the length of a thin-film strips, angle of deviation of the magnetization vectors will always be less. Due to the fact that the demagnetization magnetic field is inversely proportional to the width of a thin-film strips, deviation vectors magnetization working thin-film strips and, consequently, its sensitivity will be higher than these values for the narrow ballast thin-film strips shoulders 12-14. When applying the second planar Explorer 17 DC correct polarity created them magnetic field expands the magnetization vector working thin-film strips shoulder 11 of up to 45 degrees, which corresponds to it (and head-) maximum sensitivity.
Due to technological and structural causes of the working thin-film strip shoulder 11 vector of magnetization of ferromagnetic film 5 can be directed not at the optimal angle of 45 degrees. For setting the optimal angle of the direction of the magnetization vector in a production of thin-film strip in the second planar Explorer 17 current is supplied to the desired polarity, which creates a constant magnetic field, vector of magnetization of ferromagnetic film 5 up to an angle of 45 degrees, that ensures maximum sensitivity and linearity range head-. The sensitivity of ballast stripes at the shoulders 12-14 four times less than the sensitivity of the working thin-film strips provided that their magnetization vector directed angle of 45-degree relative length of a thin-film strips. Actually, the vector directions of magnetization ballast strips significantly less than this angle, which further reduces their sensitivity on the sensitivity of the working thin-film strips.
Local magnetic field acting on the operating leverage 11 of the bridge circuit head-, leads to a change in vector direction of the magnetization of the ferromagnetic film 5, that changes the magnetoresistance of a thin-film strips and leads to signal reading. Similarly sensor magnetic field with a guide management head-gradiometer will have with a linear plot (figure 3). This figure shows the waveform of the experimental head- for sizes FeNiCo 6 stripes of the size 20 x 120 mm 2 for the thickness of the ferromagnetic film 25 nm. But due to the fact that in valves- only one working shoulder 11, its sensitivity, compared with sensor magnetic field with a guide management, several times less and reaches not more than 0.1 mV/(). Real weakening the influence of a homogeneous magnetic field on the signal head- has a value of about 20 times.
Thus, the proposed head-gradiometer does not require for creation of linear current in the conductor, responds to the local magnetic field near the working shoulder bridge circuit of the head and does not generate a signal reading exposed to a uniform magnetic field, having high technical characteristics.
This head-gradiometer is intended to measure the local magnetic field working thin-film strip. One of its applications is to measure the surface magnetic fields generated by the operating circuit Board or chip.
1. head-gradiometer containing substrate with dielectric layer on which are connected in a bridge circuit nonmagnetic jumpers four of a number of series-connected same jumpers in each arm of the bridge circuit magnetoresistive thin-film strips containing each upper and lower layers, between which is a ferromagnetic film, the first insulating layer on top of the magnetoresistive thin-film strips, which formed the first planar conductor with working parts, located above the thin film stripes, and second, the insulation layer, the second planar Explorer, going over and along the work of a thin-film stripe, and a protective layer, all magnetoresistive thin-film strips are one, all magnetoresistive thin-film strips axis easy magnetization of the ferromagnetic film is directed at the angle of 45 degrees relative to the longitudinal axis of a thin-film bar and the operating leverage of the bridge circuit, the closest to the edge of the head-, removed from three ballast shoulders of the bridge circuit, is characterized by the fact that the width of ballast thin-film strips N times smaller than the width of the working thin-film strips and ballast number of the bridge circuit consists of a set of N parallel United magnetoresistive thin-film strips of the same length.
2. head-gradiometer according to claim 1, wherein the ballast magnetoresistive thin-film strips are located along the axis of easy magnetization of ferromagnetic film, and their length is determined by the equation of resistance of the working thin-film strips and a set of N parallel United ballast magnetoresistive thin-film strips.