Thin-film magnetic material

 

(57) Abstract:

The invention relates to magnetic materials that can be used in electronics, nanotechnology, magneto-optics, and so on, a thin-film magnetic material is an organic compound, chemically related to metal ions, made in the form of layered molecular structure of Langmuir films which includes an ordered two-dimensional monolayers of ions of rare earth metals. The invention provides the possibility of obtaining even a single two-dimensional monolayer. 1 C.p. f-crystals, 3 ill.

The invention relates to magnetic materials, in particular thin-film magnetic materials that can be used to create functional elements in electronics, nanotechnology, magneto-optics, and magnetic memory and magnetic coatings.

Known ferrite film, made by a method for producing a ferrite films [1] and which can be used in the manufacture of integrated circuits microwave range, elements of computer memory. In this way we obtain a film of ferrite of the composition of the NiFe2O4(spinel) and Y3Fe5O12(garnet) with a thickness of 50-500 μm on chromagranin characteristics. The disadvantage of ferrite films prepared in this way is that the film cannot be made thin enough. The minimum thickness of this film of 50 μm, which does not allow you to use it to create functional elements in nanotechnology.

Known thin-film magnetic material [2], obtained on the basis of organic compounds and intended for elements of functional electronics. Known material contains an organic binder - aminouksusnoy acid and the metal is gadolinium, which form a chemical compound - hexadecanethiol. It is obtained by chemical reaction of an aqueous solution of gadolinium sulfate and glycine. The resulting material is in the form of a film thickness of 0.5-0.6 μm on various substrates is non-toxic and has a hysteresis loop of a ferromagnetic properties (B=110 T, H = 20 a/m).

The disadvantage of this material is that of a film obtained from a glassy acid glycinate of gadolinium sulfate, dried at 100-120oC, resulting in the extremely minimum thickness of the film of 0.5-0.6 μm, which does not allow you to use it to create functional elements in nanotechnology, in addition, thin the magnetic parameters and magnetic properties.

The inventive thin film magnetic material is an organic compound, chemically related to metal ions, made in the form of layered molecular structure of Langmuir films with included N 1 an ordered two-dimensional monolayers of ions of rare earth metals, the rare earth metal is used gadolinium. Common essential features of the proposed and known material is that it contains organic compound, chemically related to metal ions.

Significant difference from the claimed material is the fact that it is made in the form of layered molecular structure of Langmuir films with included N 1 an ordered two-dimensional monolayers of ions of rare earth metal, while optimal as the rare earth metal to use gadolinium.

The inventive thin film magnetic material is an ultra-fine metal magnetic film, the minimum thickness which corresponds to the thickness of a single Langmuir monolayer containing ions of a rare earth metal, and when using stearic acid is .

Magnetic ordering is the material possesses high stability of the magnetic properties and uniformity of structure.

The essence of the invention and achieved results are explained on the drawings.

In Fig. 1 shows the temperature dependence of the intensity and width of the signal electron paramagnetic resonance (EPR). Curve 1 is the intensity of the EPR signal. Curve 2 is the width of the EPR signal.

In Fig. 2 shows EPR spectra of thin film magnetic material. Curve 1 corresponds to a temperature of 500 K (paramagnetic phase). Curve 2 corresponds to a temperature of 300 K (magnetically ordered phase).

In Fig. 3 shows discopolis hysteresis spectra of microwave absorption. Curve 1 corresponds to the magnetic field is increased from zero to the maximum value. Curve 2 corresponds to the magnetic field is decreased from the maximum value to zero.

The invention consists in the fact that as an organic substance to create thin-film material used amphiphilic compounds whose molecules form a Langmuir monolayer on the surface of the aqueous phase. Classic substances for the formation of Langmuir monolayers at the interface water - air are fatty acids, especially stearic acid. Fatty acids are molecular p the military negatively charged surface of the monolayer can interact in the aqueous phase of oppositely charged metal ions with the formation of ionic and coordination bonds. With the increase of the charge of an ion, typically, significantly increases the strength of binding of the ion with the monolayer and the stability of the resulting monolayers.

The monolayer with adsorbed ions from solution can then be transferred to a solid substrate by a known method Langmuir or its varieties. In the solution along with the introduced ions of rare earth metals may be present other ions that can be adsorbed on the monolayer and also be included in the structure of the thin-film magnetic material. As a result, the surface of the solid substrate is formed of a strictly two-dimensional planar metal-containing Langmuir film. The high degree of ordering of the molecular structure of the film and two-dimensional layered nature of the location in it's magnetic ions provide the appearance of such films new useful properties which distinguish them from properties of the corresponding metals and other ionic compounds, in particular, the occurrence of magnetic ordering at relatively high temperatures.

A significant difference and advantage of the inventive thin film magnetic material from well-known is in principle possible in the East the molecular structure of Langmuir films, that is unattainable by other methods, including the most modern methods of molecular beam epitaxy. The receipt of such two-dimensional ensembles of metal ions with magnetic ordering at room and higher temperatures is important and promising for making devices nanoelectronics and nanotechnology.

The inclusion in the structure of the films trivalent magnetic ions of rare earth metals provides extremely high stability of the material. The so-obtained film of gadolinium stearate when heated to 650 K and subsequent cooling to room temperature did not lose their magnetic properties. Thin-film magnetic material can be obtained on atomically smooth solid substrate capable of forming a flat layer of ions of rare earth metals in the structure deposited on a substrate Langmuir films.

The aqueous phase under the monolayer fat (stearic acid) contains ions of rare earth metals with adsorption of metal ions from the aqueous phase to the surface of the Langmuir monolayer. Along with the introduced ions of rare earth elements can be adsorbed on the monolayer and other ions present in solution and which can also on-5 up to 10-3M

The monolayer with adsorbed thereon metal ions rises to values of surface pressure of 20 to 35 mn/m, and after equilibrium is transferred to the prepared solid-state substrate. The result is a structure representing a flat two-dimensional monatomic layers of magnetic metal ions included in the multilayer structure of Langmuir films of amphiphilic organic molecules, in particular of fatty acids. The ions of metal you localized region of polar fragments of amphiphilic molecules with which they form a complex in the binding of the aqueous phase.

The distance between the layers of the polar groups of the amphiphilic molecules in the multilayer structure of Langmuir films strictly deterministic structure of amphiphilic molecules and their packing in the structure of the multilayer films. Thus, the distance between the layers of magnetic ions in the multilayer films is strictly equal to the distance between the regions of the polar head, which in the case of Langmuir films of fatty acids (structure Y type) is

The number of layers of magnetic ions in a multilayer Langmuir film on the same substrate can be dostate film.

To obtain a thin-film magnetic material was used a solution of stearic acid (C18H32O2) in chloroform concentration 210-4M, which is deposited on the surface of the ultrapure water produced MiliQ company Milipor and containing ions Gd3+at a concentration of 510-4M. Over 5 min, required for evaporation of the chloroform, the monolayer deep, responsible way barrier to the magnitude of the surface pressure P=30 mn/m with a speed of 3 AND2/molecule min. Surface pressure of the monolayer was measured using scales of Wilhelmi. Then after establishment of equilibrium in the system by the method of Langmuir monolayer was transferred to a solid substrate (polished silicon) size 330 mm Serial repetition of the transfer of the monolayer from the surface of the aqueous phase on a solid substrate were obtained from samples containing 1; 10; 25; 50 and 100 layers of ions of gadolinium incorporated in the layered structure of multilayer Langmuir-Blodgett films.

Spectra of electron paramagnetic resonance (EPR) were obtained on an EPR spectrometer-4 "Varian (USA).

Due to the extremely small characteristic size of the resulting thin-film magnetic material and respectively small to astronomo paramagnetic resonance (EPR), (Fig. 1 - 3). The spectra of microwave absorption of the samples indicate the existence of the resulting material of the magnetic ordering at temperatures below the critical T = 470 K (Fig. 1 - 3). The intensity of the EPR signal Gd3+(Fig.1), defined as the product of the amplitude of the signal (U)2near T0has a maximum and decreases as the temperature increase in the paramagnetic region (T > T0), and with decreasing temperature in the region of the magnetic ordering (T < T0) (Fig. 1). The width H of the EPR signal Gd3+(Fig. 2) increases sharply when approaching T0(Fig. 1). At the same time a decrease of the resonance field (increase g-factor). This temperature behavior characteristics of the EPR signal characteristic for the transition of ions - EPR centers in the magnetically ordered state.

Below the transition temperature in thin-film magnetic material is observed dependence of the microwave absorption spectrum of its initial magnetic state. The spectra of the original unmagnetized material and material that had been in a significant (> 0.05 Tesla) magnetic field differ especially in the area of small external field, where the outer and inner field (field nominalia field (Fig. 3).

In addition, when T < T0in the material there is a noticeable dependence of the Z on the speed of razvedki external magnetic field. This indicates slow magnetic relaxation in thin-film magnetic material, which is also the case for magnetically ordered state. Features of microwave absorption spectra, similar to those obtained in the thin-film magnetic material, are also observed in ferromagnetic films based on Fe2O3that confirms the presence of ferromagnetic ordering in the inventive thin film magnetic material.

Thin-film magnetic material, made in the form of layered molecular structure of Langmuir films which includes an ordered two-dimensional monolayers of ions of rare earth metals (specific implementation - gadolinium Gd3+has magnetic ordering patterns already at temperatures below 650 K. the thin-film magnetic material has a high stability of the magnetic properties.

This material has an extremely high stability and uniformity of structure (including high order and packing density of ions of gadolinium in plasko. Thin-film magnetic material containing organic compound, chemically related to metal ions, characterized in that it is made in the form of layered molecular structure of Langmuir films includes N1 ordered two-dimensional monolayers of ions of rare-earth metal.

2. The material under item 1, characterized in that the rare earth metal is used gadolinium.

 

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