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Article
Effect of the Cobalt Concentration on the Magnetic Properties of Co1 – xMgxFe2O4 Nanocrystals
Nanoparticles of Co1 – xMgxFe2O4 with x equal to 0, 0.2, 0.4, 0.6, 0.8, and 1.0 have been synthesized. For all values of x, they are nanocrystals with a cobalt ferrite structure and an average linear size ( ...
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Article
Auger Electron Spectroscopy of Thin Cr2GeC Films
Auger electron spectroscopy was used to determine the phase composition of Cr2GeC MAX phase thin films. A distinctive feature of the formation of carbon-containing MAX phases is the shape of carbon Auger peaks, w...
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Article
Magneto-Optical Ellipsometry of Thin Films with Optical Uniaxial Anisotropy
In this paper, we solve the inverse problem of magneto-optical ellipsometry for thin ferromagnetic films with optical uniaxial anisotropy. We work within the framework of the approach we developed earlier anal...
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Article
Ferromagnetic Silicides and Germanides Epitaxial Films and Multilayered Hybrid Structures: Synthesis, Magnetic and Transport Properties
Planar and vertical hybrid structures, which combine ferromagnetic and semiconductor layers are essential for implementation and study of spin transport phenomena in semiconductors, which is crucial for the ad...
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Article
Structural Disorder, Specific Heat, and Magnetic Transitions in Cu2FeBO5
Cu2FeBO5 ludwigite single crystals have been grown from a solution–melt by spontaneous crystallization. Using the X-ray diffraction method, the crystal structure has been resolved in detail. Cations in sites M2, ...
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Article
Open AccessMagnetic Structure and the Spin-Crossover Mechanism in Ludwigite Со3BO5
A spin-crossover mechanism in ludwigite Со3BO5 is proposed on the basis of the DFT calculation with SCAN potentials. The role of separate exchange interactions in the establishment of the long-range magnetic orde...
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Article
Photoinduced Enhancement of the Excitonic Order in Strongly Correlated Electron Systems with the Spin Crossover
A new mechanism of the photoinduced enhancement of the excitonic order in strongly correlated electron systems with the spin crossover through the generation of a massive mode in the spectrum of collective exc...
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Article
Open AccessExcitonic Order in Strongly Correlated Systems with the Spin Crossover
Features of the formation of the magnetic structure and the exciton Bose–Einstein condensate phase of magnetic excitons in strongly correlated systems near the spin crossover have been considered with the effe...
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Article
Open AccessMagnetic Properties of FeBO3 in the Low-Spin State
Changes in the magnetic properties of FeBO3 single crystals in the course of spin crossover occurring with increasing pressure up to 63 GPa are studied both experimentally and theoretically. Simultaneous measurem...
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Article
Influence of a Strong Magnetic Field on the AC Transport Properties of Fe/SiO2/n-Si MIS Structure
The ac transport properties of a Fe/SiO2/n-Si MIS structure made in the form of a Schottky diode have been studied in magnetic fields up to 9 T. A shift in the maxima of the temperature dependences of the impedan...
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Article
On the Possible Magnetic Properties of Ultrathin Mn2GaC Films on Al2O3 Substrates
The possibility of growth of thin Mn2GaC MAX phase films on Al2O3 substrates with various orientations and their magnetic properties have been studied. The most favorable orientation relationships and interface p...
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Article
Effect of Substitution on Magnetic Moments of Iron and Chromium Atoms in MAX Phases of Type (Cr4 – xFex)0.5SiC: Theoretical Calculation
MAX phases are a family of ternary layered compounds with formal stoichiometry M2AX and have a layered hexagonal structure. Calculations with the B3LYP density functional show that, by varying the ratio between t...
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Article
The Ratio of the 90° and 180° Exchange Contributions in Monoxides NiO and CoO at Normal and High Pressure
The 90° and 180° super-exchange interaction in the Mott–Hubbard dielectrics NiO and CoO under normal conditions and at high hydrostatic pressure, which leads to spin crossover on magnetic ions, is estimated. I...
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Article
Fluctuations of the Multiplicity of Co3+ Ions and Softening of the Phonon Spectrum of Rare-Earth Cobalt Oxides
An unconventional temperature dependence of infrared absorption spectra of rare-earth cobalt oxides LaCoO3 and GdCoO3 has been studied experimentally and theoretically in the temperature range of 3.2–550 K. A qui...
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Article
Magneto-Optical Parameter Q for Structures with Uniaxial Optical Anisotropy
This paper is devoted to the development of reflection magneto-optical ellipsometry. We have solved the inverse problem for structures with uniaxial optical anisotropy: have determined the reflection coefficie...
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Article
Why the Magnetite–Gold Core–Shell Nanoparticles Are Not Quite Good and How to Improve Them
The nature of the formation of a chemical bond at the magnetite–gold interface has been studied. The geometric structure and the electronic and magnetic properties of plane layers consisting of magnetite Fe3O4 an...
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Article
Electronic Properties of NiO at Ultrahigh Pressure
The effect of the high pressure on the electronic properties of NiO is studied within the multielectron approach. The low energy physics is described by the effective Hubbard model based on Ni d-electrons and O p
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Article
Role of Interfaces in the Permittivity Tensor of Thin Layers of a Ferromagnetic Metal
It is known from experimental studies that the components of the permittivity tensor ε depend on layer thicknesses of multilayer thin films, and for nanometer layers, it is necessary to additionally consider t...
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Article
Spin-Flop Transition in Co2B2O5 Pyroborate
Cobalt pyroborate Co2B2O5 single crystals have been obtained by spontaneous crystallization from solution–melt. Powder X-ray diffraction measurements have revealed the triclinic symmetry
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Article
Light-Induced Ultrafast Dynamics of Spin Crossovers under High Pressure
Within the multielectron model of magnetic insulator with two different spin terms at each cation and spin crossover under high pressure we have studied dynamics of a sudden excited non equilibrium spin state....
