The interlayer interactions in multilayer systems with a non-magnetic semimetallic interlayer are great of interest. The magnetic and structural properties of the DyxCo1-x/Bi/Py systems (17 < x < 26 at.

The utilization of graphene on silicon carbide (SiC) substrates holds substantial promise for advancements in spintronics and nanoelectronics. Furthermore, incorporating magnetic metals provides an optimal framework for probing fundamental physical phenomena. The approach to developing such systems is in situ intercalation of graphene with magnetic metals. Herein, the electronic structure is analyzed and the magnetic properties of the system are synthesized by the thermal decomposition of 6H‐SiC(0001) surface and subsequent intercalation of graphene with cobalt (Co) and iron (Fe) atoms. X‐ray photoemission spectroscopy and low‐energy electron diffraction are employed to control the synthesis and metal intercalation processes. The morphological characteristics of the synthesized system are studied by means of atomic force microscopy. The findings derived from magneto‐optic Kerr effect measurements reveal a homogeneous ferromagnetic ordering at room temperature. Angle‐resolved photoemission spectroscopy is used to ascertain the impact of intercalation on graphene's electronic structure. The results of this study are essential for the development of graphene‐based spintronics and nanoelectronic devices as well as for fundamental studies in magnetic graphene systems.

The article discusses the synthesis of new complex ferrite, radiographic and electron microscopic studies. The phase of complex ferrites was synthesized by the method of high-temperature sol-gel synthesis. For the first time, the structure of CrKFe2O5 Composite ferrite was studied by X-ray phase analysis and scanning electron microscope methods, the syngony type, elementary cell parameters, radiographic and pycnometric densities, and elemental analysis were determined. A comparative analysis of the relationship between the parameters of the Crystal cell of primary substances and the parameters of the obtained complex ferrite Crystal cell was carried out. Micro-samples were taken from different parts of the crystallite obtained through a scanning electron microscope, the elemental composition of the crystals was analyzed, and the general type of layer of the complex ferrite surface was demonstrated. As a result, the fact that the compound consists of two phases, the clarity of its construction was determined by the topography and chemical composition of the compound. As a result, it was found that the newly synthesized complex ferrite corresponds to the Formula CrKFe2O5. The particle size of the compounds formed is large (between 200 μm, 20.0 μm, 5.00 μm and 2.00 μm).

We report on the results of experimental and theoretical studies of magnetic superlattices [(CoP)(soft)/(NiP)(am)/(CoP)(hard)/(NiP)(am)](n) (n = 1, 5, 10, 15, 20, 40, t(CoP) = 5 nm, t(NiP) = 2 nm) produced by electroless deposition method. Cross-section electron microscopy image shows the layers do not mix and the interfaces between the layers are not blurred. We found the behavior of the magnetic hysteresis loops is similar to the exchange spring. Three peaks of microwave absorption are observed in the electron magnetic resonance spectra. To explain this, a model of a three-sublattice magnet with long-range interlayer interaction due to magnetic proximity effect is proposed. A perpendicular magnetic anisotropy is formed at the interface between the magnetic and nonmagnetic layers. The interlayer interaction between the nearest magnetically soft and hard (J(1)) layers is found to be negative, the interaction between magnetically soft layers (J(2)) is positive, while J(1) is about an order of magnitude greater than J(2).

In this article, the sol-gel method was used as a synthesis method, which shows the physico –chemical nature of the synthesis of a new complex material ferrit Li0.5MnFe1.5O4. The synthesized structure and structure were determined by the method of X-ray phase analysis. According to the analysis indicators, it was found that our compound is single-phase, spinel-structured, and syngony - cubic type. The microstructure of the compound and the quantitative composition of the elements contained were analyzed under a scanning electron microscope (SEM). Through a scanning electron microscope, Microsystems were taken from different parts of l Li0.5MnFe1.5O4-type crystallite, the elemental composition of crystals was analyzed, and the general type of surface layer of complex ferrite was shown. As a result, the fact that the compound consists of a single phase, the clarity of its construction was determined by the topography and chemical composition of the compound. As a result, it was found that the newly synthesized complex ferrites correspond to the Formula Li0.5MnFe1.5O4. The particles of the formed compounds have a large size (between 50.0 μm, 20.0 μm and 10.0 μm). Electro physical measurements were carried out on the LCR - 800 unit at intervals of 293-483 K and at frequencies of 1.5 and 10 kHz. The increase in frequency to 10 kHz led to a decrease in the value ε in the range of the studied temperature (293-483 K).

This work presents the results of the experimental studies of the magnetic resonance properties of the Y0.5Sr0.5Cr0.5Mn0.5O3 polycrystalline system. We found that two absorption lines are observed in the magnetic ordering region at T < 80 K in the spectrum. When changing to the paramagnetic region, one of the lines disappears, but a set of weak lines appears, which are identified as belonging to the Mn2+ impurity ions. The temperature behavior of the main peak line width is analyzed within the framework of the single-ion relaxation theory. Mn3+ ions were found to be responsible for the low- temperature peak, and Cr4+ ions are responsible for the high-temperature peak. The constants of the molecular fields acting on the Mn3+ and Cr4+ subsystems have been determined.

In this article, the sol–gel method was used as a synthesis method, which shows the physicochemical nature of the synthesis of a new complex material, ferrite Li0.5MnFe1.5O4. The structure and composition of the synthesized ferrite were determined by X-ray phase analysis. According to analysis indicators, it was found that our compound is a single-phase, spinel-structured, and syngony-cubic type of compound. The microstructure of the compound and the quantitative composition of the elements contained within it were analyzed under a scanning electron microscope (SEM). Under a scanning electron microscope, microsystems were taken from different parts of Li0.5MnFe1.5O4-type crystallite; the elemental composition of crystals was analyzed; and the general type of surface layer of complex ferrite was shown. As a result, given the fact that the compound consists of a single phase, the clarity of its construction was determined by the topography and chemical composition of the compound. As a result, it was found that the newly synthesized complex ferrites correspond to the formula Li0.5MnFe1.5O4. The particles of the formed compounds have a large size (between 50.0 μm or 20.0 μm and 10.0 μm). Electrophysical measurements were carried out on an LCR-800 unit at intervals of 293–483 K and at frequencies of 1.5 and 10 kHz. An increase in frequency to 10 kHz led to a decrease in the value ε in the range of the studied temperature (293–483 K).

MnBi2Te4, Mn(Bi,Sb)2Te4, and MnBi2Te4(Bi2Te3)m (m ≥ 1) are assigned to magnetic topological insulators. Successful application of these materials in nanoelectronic devices calls for comprehensive investigation of their electronic structure and magnetic properties in dependence of the Bi/Sb atomic ratio and the number m of Bi2Te3 blocks. The magnetic properties of the surface of MnBi2Te4, MnBi4Te7, and Mn(Bi _1-x Sbx)2Te4 compounds (x = 0.43 and 0.32) have been studied using the magneto-optical Kerr effect. It is shown that the temperatures of magnetic transitions on the surface and in the bulk of MnBi4Te7 and Mn(Bi, Sb)2Te4 differ significantly.

The article discusses for the first time the synthesis, radiographic and electron microscopic examination of CrNaFe2O5, synthesized using the high – temperature Sol-gel method. The phase of complex ferrites was synthesized using Sol-Gel synthesis method at high temperature. Initially, the structure of CrNaFe2O5 composite ferrite was researched by X-ray phase analysis and SEM, the syngony type, elementary cell parameters, radiographic and pycnometric densities and elemental analysis were defined: CrNaFe2O5 -а=5.0289, в= 5.0289, с=13.6938 Å , ρx-ray.= 5.327 g/sm3 , ρpycn.=5.331 g/sm3. A comparative analysis of the connection between the parameters of the Crystal cell of the initial materials and of the obtained complex ferrites was carried out. Through a scanning electron microscope, microsystems were taken from different parts of CrNaFe2O5 type crystallite, the elemental composition of crystals was analyzed, and the general type of surface layer of complex ferrite was displayed. As a result, the fact that the compound consists of a single phase, the clarity of its construction was determined by the topography and chemical composition of the compound. Consequently, it was discovered that the newly synthesized complex ferrites correspond to the formula CrNaFe2O5. The particles of the formed compounds have a large size (between 200 µm, 20.0 µm and 5 µm). The results of the element analysis show that the compound is compatible.

Материалы MnBi2Te4, Mn(Bi,Sb)2Te4 и MnBi2Te4(Bi2Te3)m (где m ≥ 1) относятся к классу магнитных топологических изоляторов. Для успешного применения данных материалов в устройствах наноэлектроники необходимо всестороннее изучение их электронной структуры и магнитных свойств в зависимости от соотношения атомов Bi/Sb и количества (m) блоков Bi2Te3. Изучались магнитные свойства поверхности соединений MnBi2Te4, MnBi4Te7 и Mn(Bi1–xSbx)2Te4 (где x = 0.43, 0.32) при помощи магнитооптического эффекта Керра. Показано, что температуры магнитных переходов на поверхности и в объеме MnBi4Te7 и Mn(Bi,Sb)2Te4 существенно различаются.

Using the methods of atomic force and electron microscopy and the magneto-optical Kerr effect, the role of the interface, roughness, and thickness of the magnetic layer in the temperature-dependent magnetic properties of thin Al2O3–Co films with a naturally oxidized cobalt surface was studied. The layers were deposited by magnetron sputtering. The thickness of the cobalt layer varied from 2 to 100 nm. For the first time, the dependences of coercive forces and exchange displacements on the thickness of the cobalt film in the temperature range from 80 to 300 K were obtained and analyzed. The contribution to the coercive force and exchange displacement from the oxidized cobalt surface increases as the temperature decreases below 160 K. The magnitude of the contribution depends on the base material on which the cobalt film is deposited and is maximum for a cobalt film with a thickness of ∼20 nm in the Al2O3/Co structure. A weakly magnetic layer was found at the Al2O3/Co interface. The behavior of the exchange bias in this layer is similar to the behavior of a ferromagnetic Co core with a naturally oxidized CoO shell. The thickness of this layer depends on the speed and order of deposition of the layers. When the order of deposition of layers (Co/Al2O3) changes, the behavior of the exchange displacement of the interface becomes similar to that observed in the ferromagnet/antiferromagnet system. That is, when the deposition order changes, the value of the exchange shift changes sign when the cobalt layer thickness is below 10 nm.

In this paper, we explore the suggestions of the results of experimental studies on low-dimensional layered systems in FeNi/V2O3/FeNi film structures. The multifunctional material V2O3 is used as an interlayer between the magnetically active FeNi layers. The films were obtained by ultrahigh vacuum magnetron sputtering on a glass substrate with a base size of 10−10 Torr. It has been found that for V2O3 films, the decrease in the metal–semiconductor transition temperature increases significantly. Magnetic characteristics were studied on the MPMS-XL SQUID magnetometer. The exchange effect occurs both in the region where the oxide has a magnetic order and in the paramagnetic region. The latter is due to the effect of the magnetic panel in the oxide package. The phenomenon of oscillation of the exchange field occurs depending on the phenomenon of intermediate observation observed experimentally.

In this work,a solid solution of chromite-manganite of the composition Y0,5Ca0,5Cr0,5Mn0,5O3 was synthesized using the sol-gel method. Based on the results of experimental studies of the magnetostatic properties of the polycrystalline system Y0,5Ca0,5Cr0,5Mn0,5O3. It is found that the predominant is the intracrystalline ferromagnetic interaction, while the intercrystalline interaction is antiferromagnetic in nature.In the field of 2000 Oe and 5000 Oe at a temperature of 5 K, the magnetic moment is not even positive. These dependencies were obtained after the sample was in a large negative field. This initial moment is approximately equal to the residual moment on the hysteresis loop for a temperature of 5 K. When the external field is increased gradually, for example, in increments of 250 Oe, this moment increases to 1.2 emu/g at 2000 Oe. Based on the results of magnetostatic measurements, it was found that hysteresis loops of magnetization are observed at low temperatures.

A tetravalent-substituted cobalt ludwigite Co2.5Ge0.5BO5 has been synthesized using the flux method. The compound undergoes two magnetic transitions: a long-range antiferromagnetic transition at TN1 = 84 K and a metamagnetic one at TN2 = 36 K. The sample-oriented magnetization measurements revealed a fully compensated magnetic moment along the a- and c-axes and an uncompensated one along the b-axis leading to high uniaxial anisotropy. A field-induced enhancement of the ferromagnetic correlations at TN2 is observed in specific heat measurements. The DFT+GGA calculation predicts the spin configuration of (↑↓↓↑) as a ground state with a magnetic moment of 1.37 μB/f.u. The strong hybridization of Ge(4s, 4p) with O (2p) orbitals resulting from the high electronegativity of Ge4+ is assumed to cause an increase in the interlayer interaction, contributing to the long-range magnetic order. The effect of two super-superexchange pathways Co2+-O-B-O-Co2+ and Co2+-O-M4-O-Co2+ on the magnetic state is discussed.

В нacтoящeй paбoтe зoль-гeль мeтoдoм был cинтeзиpoвaн твepдыйpacтвop хpoмитo-мaнгaнитa cocтaвa Y 0,5 Sr 0,5 Cr 0,5 Mn 0,5 O 3 . Oпpeдeлeны тип cингoнии,пapaмeтpы элeмeнтapнoй ячeйки, peнтгeнoгpaфичecкиe и пикнoмeтpичecкиe плoтнocтинoвoгo хpoмитa-мaнгaнитa. Peзультaты индициpoвaния хpoмитo-мaнгaнитa пoдтвepждaютcяхopoшим cooтвeтcтвиeм экcпepимeнтaльных и pacчeтных знaчeний oбpaтных вeличин квaдpaтoв мeжплocкocтных paccтoяний (10 4 /d 2) и coглacoвaннocтью вeличин peнтгeнoвcкoйи пикнoмeтpичecкoй плoтнocтeй. Уcтaнoвлeнo, чтo cинтeзиpoвaнный хpoмитo-мaнгaниткpиcтaллизуeтcя в opтopoмбичecкoй cингoнии и имeeт пepoвcкитпoдoбную cтpуктуpу. Пopeзультaтaм CЭМ хpoмитo-мaнгaнит являeтcя мoнoдиcпepcным и paзмep кpиcтaллитoвpacпpeдeляeтcя oт 6 дo 20 микpoнoв. Peзультaт иccлeдoвaния зaвиcимocти тeплoeмкocти oттeмпepaтуpы, пoлучeнный мeтoдoм ТГA, дoкaзывaeт cтaбильнocть внутpeннeй cтpуктуpы ипpиcутcтвия пoлимopфных пpeвpaщeний в иccлeдуeмoм oбpaзцe.

The magnetic and resonance properties of the DyMn 2 O 5 –Mn 3 O 4 nanoparticle composite have been experimentally investigated. Two magnetic transitions at temperatures of T 1 ≈ 65 K and T 2 ≈ 230 K have been established; the T 1 value differs from the temperatures of the transitions in the initial materials, which has been attributed to the interparticle interactions. Temperature T 2 corresponds to the DyMnO 3 impurity phase (1 at %). Three microwave absorption peaks have been observed in the magnetic resonance spectrum, which is explained within the model of a magnetically two-phase system. One resonance is attributed to Mn 3 O 4 , and the other two peaks are attributed to an ensemble of highly anisotropic DyMn 2 O 5 particles with a random distribution of anisotropy axes.

A study is performed of the relationship between the sizes of cobalt crystallites and the coercive and anisotropic properties of Co–P films obtained via chemical deposition. The emergence of induced anisotropy in films obtained at low pH (7.2–8.7) is due to size effects that transform the cobalt’s crystal lattice from face-centered cubic to hexagonal close-packed as the film grows in a magnetic field.

The magnetic resonance properties of a low-dimensional cobalt-Al2O3-germanium tunnel contact are studied in this work. The appearance of minima observed at low temperatures on both sides of the cobalt layer was found on the thermomagnetic curve. The value of the temperature minimum differs in magnitude on both sides of the cobalt layer. The position of the minimum in the temperature dependence of magnetization depends on the sample preparation technology. As a result of layer growth, at least two magnetic phases appear. One contribution is from the spins of ferromagnetic particles (cobalt particles with a hexagonal close packed lattice), and additional contributions from the magnetically disordered phase of fine cobalt particles and Co-Al2O3 compounds.

This article theoretically solves the problem of the thermally activated motion of gas of non-interacting magnetic vortices/skyrmions in the field of defects located randomly, i.e., anchoring centers. The properties of the anchoring centers can also fluctuate. The factor that drives the gas of quasiparticles can be of any physical nature (fields, currents, gradients of the magnetic characteristics of the magnet, and so on). The process of vortices motion is described as a sequence of thermally activated separation of vortices from the attracting centers. The cases of some model distribution functions of the energy barriers are considered: 1) the barriers are of the same height; 2) the heights of the barriers are distributed evenly; and 3) the heights are distributed according to the normal law. Within these models, analytical expressions for the drift velocity and the diffusion gas coefficient of quasiparticles are obtained.