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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Freydman A. L., Eremin E. V., Pogoreltcev E. I., Velikanov D. A.
Заглавие : Dielectric and magnetic anomalies in α-MnS single crystals at applied magnetic fIelds
Место публикации : J. Supercond. Nov. Magn. - 2022. - Vol. 35, Is. 1. - P.277-281. - ISSN 1557-1939, DOI 10.1007/s10948-021-06045-z. - ISSN 1557-1947(eISSN)
Примечания : Cited References: 22
Предметные рубрики: MAGNETOSTRICTION
ANISOTROPY
Аннотация: Temperature and magnetic field dependences of the magnetic susceptibility and dielectric permittivity of the α-MnS single crystal with NaCl structure are first investigated at around Neel temperature and at 4.2 K and H up to 70 kOe. A relation between the investigated properties was established. The founded phenomena can be due to the magnetostriction or magnetoelastic mechanism and the spin-dependent dipole moment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov A. S., Tarasov I. A., Yakovlev I. A., Rautskii M. V., Bondarev I. A., Lukyanenko A. V., Platunov M. S., Volochaev M. N., Efimov, Dmitriy D., Goikhman, Aleksandr Yu., Belyaev B. A., Baron F. A., Shanidze, Lev V., Farle M., Varnakov S. N., Ovchinnikov S. G., Volkov N. V.
Заглавие : Asymmetric interfaces in epitaxial off-stoichiometric Fe3+xSi1-x/Ge/Fe3+xSi1-x hybrid structures: Effect on magnetic and electric transport properties
Коллективы : RFBRRussian Foundation for Basic Research (RFBR); Krasnoyarsk Regional Fund of Science [20-42-243007, 20-42-240012]; Government of the Russian Federation [075-15-2019-1886]; Ministry of Science and Higher Education of the Russian Federation [FZWN-2020-0008]
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 1. - Ст.131. - ISSN 2079-4991(eISSN), DOI 10.3390/nano12010131
Примечания : Cited References: 61. - The research was funded by RFBR, Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science, project number 20-42-243007, and by the Government of the Russian Federation, Mega Grant for the Creation of Competitive World-Class Laboratories (Agreement no. 075-15-2019-1886). I.A.T. and S.N.V. thank RFBR, Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science, project number 20-42-240012, for partial work related to the development of the simulation model of the pore autocorrelated radial distribution function coupled with the near coincidence site model, the Fe3+xSi1-x lattice distortion analysis, and processing Rutherford backscattering spectroscopy data. The Rutherford backscattering spectroscopy measurements were supported by the Ministry of Science and Higher Education of the Russian Federation (project FZWN-2020-0008)
Предметные рубрики: FILMS
ANISOTROPY
SI(001)
DEVICES
SURFACE
GROWTH
Аннотация: Three-layer iron-rich Fe3+xSi1-x/Ge/Fe3+xSi1-x (0.2 x 0.64) heterostructures on a Si(111) surface with Ge thicknesses of 4 nm and 7 nm were grown by molecular beam epitaxy. Systematic studies of the structural and morphological properties of the synthesized samples have shown that an increase in the Ge thickness causes a prolonged atomic diffusion through the interfaces, which significantly increases the lattice misfits in the Ge/Fe3+xSi1-x heterosystem due to the incorporation of Ge atoms into the Fe3+xSi1-x bottom layer. The resultant lowering of the total free energy caused by the development of the surface roughness results in a transition from an epitaxial to a polycrystalline growth of the upper Fe3+xSi1-x. The average lattice distortion and residual stress of the upper Fe3+xSi1-x were determined by electron diffraction and theoretical calculations to be equivalent to 0.2 GPa for the upper epitaxial layer with a volume misfit of -0.63% compared with a undistorted counterpart. The volume misfit follows the resultant interatomic misfit of |0.42|% with the bottom Ge layer, independently determined by atomic force microscopy. The variation in structural order and morphology significantly changes the magnetic properties of the upper Fe3+xSi1-x layer and leads to a subtle effect on the transport properties of the Ge layer. Both hysteresis loops and FMR spectra differ for the structures with 4 nm and 7 nm Ge layers. The FMR spectra exhibit two distinct absorption lines corresponding to two layers of ferromagnetic Fe3+xSi1-x films. At the same time, a third FMR line appears in the sample with the thicker Ge. The angular dependences of the resonance field of the FMR spectra measured in the plane of the film have a pronounced easy-axis type anisotropy, as well as an anisotropy corresponding to the cubic crystal symmetry of Fe3+xSi1-x, which implies the epitaxial orientation relationship of Fe3+xSi1-x (111)[0-11] || Ge(111)[1-10] || Fe3+xSi1-x (111)[0-11] || Si(111)[1-10]. Calculated from ferromagnetic resonance (FMR) data saturation magnetization exceeds 1000 kA/m. The temperature dependence of the electrical resistivity of a Ge layer with thicknesses of 4 nm and 7 nm is of semiconducting type, which is, however, determined by different transport mechanisms.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Izotov A. V., Belyaev B. A., Boev N. M., Burmitskikh A. V., Leksikov An. A., Skomorokhov G. V., Solovev P. N.
Заглавие : Tailoring the microwave properties of thin permalloy films using a periodically grooved substrate
Коллективы : Ministry of Science and Higher Education of the Russian Federation [075-11-2019054]
Место публикации : Physica B. - 2022. - Vol. 629. - Ст.413654. - ISSN 0921-4526, DOI 10.1016/j.physb.2021.413654. - ISSN 1873-2135(eISSN)
Примечания : Cited References: 50. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation, agreement number 075-11-2019054 dated November 22, 2019
Предметные рубрики: FERROMAGNETIC-RESONANCE
MAGNETIC-PROPERTIES
ANISOTROPY
FREQUENCY
Аннотация: Thin magnetic films with periodic surface topography are of special interest for microwave applications as their static and dynamic magnetic characteristics can be readily adjusted. In this paper, we explore the capabilities of a simple method for producing large-area periodically patterned films by creating regularly spaced grooves on a substrate using a diamond cutter. For 110-nm-thick films, it was found that the substrate-topography-induced magnetic anisotropy was inversely proportional to the pattern period, which in experimental samples varied from 5 to 20 mu m. Based on the Netzelmann theory, analytical expressions for demagnetization tensor components were obtained, which accord well with the experimental data. The measurements of the natural ferromagnetic resonance spectra demonstrated that the increase of the topography-induced magnetic anisotropy with the decrease of the pattern period led to the increase of the resonance frequency from 0.65 to 1.86 GHz, and to a decrease of the linewidth and effective damping parameter.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vas'kovskiy V. O., Volochaev M. N., Gorkovenko A. N., Kravtsov E. A., Lepalovskij V. N., Feshchenko A. A.
Заглавие : Structural features and magnetic properties of Co-W films
Коллективы : Ministry of Science and Higher Education of the Russian Federation [FEUZ-2020-0051]
Место публикации : Phys. Solid State. - 2021. - Vol. 63. Is. 7. - P.1113-1119. - ISSN 1063-7834, DOI 10.1134/S1063783421070246. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 23. - This work was carried out with support by the Ministry of Science and Higher Education of the Russian Federation, topic no. FEUZ-2020-0051.
Предметные рубрики: GIANT MAGNETORESISTANCE
ANISOTROPY
Аннотация: The structure and magnetic properties of thin polycrystalline films of Co100 – xWx (0 ≤ x ≤ 30) deposited by magnetron sputtering on glass substrates are investigated including those containing buffer layers of Ta, W, and Ru. It is found that films of pure Co are non-single-phase and contain hcp and fcc crystalline modifications. Doping leads to an increase in the concentration of the fcc phase and an enhancement of the texture of the (111) type, and subsequently to the amorphization of the films. The buffer layers influence to a certain extent on the depth and concentration localization of these transformations. A characteristic feature of the magnetism of Co–W films is a significant perpendicular component in the macroscopic magnetic anisotropy, which leads to a “supercritical” magnetic state. It is shown that its source is the textured fcc phase, the crystalline anisotropy of which is enhanced as a result of doping of cobalt with tungsten.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovev P. N., Izotov A. V., Belyaev B. A.
Заглавие : Numerical study of structural and magnetic properties of thin films obliquely deposited on rippled substrates
Коллективы : RFBRRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund; JSC 'NPP Radiosviaz' [20-42-242901]
Место публикации : J. Phys.: Condens. Matter. - 2021. - Vol. 33, Is. 49. - Ст.495802. - ISSN 0953-8984, DOI 10.1088/1361-648X/ac26fc. - ISSN 1361-648X(eISSN)
Примечания : Cited References: 35. - The reported study was funded by RFBR, the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund and JSC 'NPP Radiosviaz', Project Number 20-42-242901
Предметные рубрики: SIMULATION
ANISOTROPY
GROWTH
Аннотация: Structural modulation in thin films plays a substantial role in the formation of their magnetic properties. By producing topographic patterns in thin films, it is possible to engineer their magnetic response. Here, we report on the numerical study of the relationship between structural and static magnetic properties of thin films obliquely deposited on substrates with the sinusoidal surface. 3D Monte Carlo film growth simulations show that, under certain deposition conditions, an inhomogeneous columnar morphology can form in the films caused by the shadowing effect and the rippled substrate. Calculations of the demagnetizing tensors for these films demonstrate that their columnar structure is the source of the shape-induced uniaxial magnetic anisotropy that varies nonmonotonically with the deposition angle. Micromagnetic simulations of the generated films confirm the uniaxial character of the shape-induced anisotropy, and also show that magnetization reversal occurs via an incoherent rotation of magnetic moments.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Balaev D. A., Ladygina V. P., Pankrats A. I., Yaroslavtsev R. N., Velikanov D. A., Iskhakov R. S.
Заглавие : Ferromagnetic resonance study of biogenic ferrihydrite nanoparticles: spin-glass state of surface spins
Место публикации : JETP Letters. - 2020. - Vol. 111, Is. 3. - P.183-187. - ISSN 0021-3640, DOI 10.1134/S0021364020030145. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 41. - This work was supported by the Russian Foundation for Basic Research, project no. 18-02-40137.This work was supported by the Russian Foundation for Basic Research, by the Government of Krasnoyarsk krai, by the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 19-42-240012 r_a “Magnetic Resonance in Ferrihydrite Nanoparticles: Effects Associated with the Core-Shell Structure”), and by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1263.2020.3).
Предметные рубрики: MAGNETIC-PROPERTIES
NIO NANOPARTICLES
TRANSITION
ANISOTROPY
Аннотация: Ferrihydrite nanoparticles (2–3 nm in size), which are products of the vital activity of microorganisms, are studied by the ferromagnetic resonance method. The “core” of ferrihydrite particles is ordered antiferromagnetically, and the presence of defects leads to the appearance of an uncompensated magnetic moment in nanoparticles and the characteristic superparamagnetic behavior. It is established from the ferromagnetic resonance data that the field dependence of the frequency is described by the expression 2πν/γ = HR + H A(T=0) (1 − T/T*), where γ is the gyromagnetic ratio, HR is the resonance field, HA ≈ 7 kOe, and T* ≈ 50 K. The induced anisotropy HA is due to the spin-glass state of the near-surface regions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen K., Philippi-Kobs A., Lauter V., Vorobiev A., Dyadkina E., Yakovchuk, V. Yu., Stolyar S. V., Lott D.
Заглавие : Observation of a Chirality-Induced Exchange-Bias Effect
Коллективы : Deusche Forschungsgemeinschaft (DFG)German Research Foundation (DFG) [615811]; DFG via Sonderforschungsbereich (collaborative research center)German Research Foundation (DFG) [SFB925]
Место публикации : Phys. Rev. Appl. - 2019. - Vol. 12, Is. 2. - Ст.024047. - ISSN 2331-7019, DOI 10.1103/PhysRevApplied.12.024047
Примечания : Cited References: 68. - K.C. benefited from the support of the Deusche Forschungsgemeinschaft (DFG) via Project No. 615811. A.P.-K. gratefully acknowledges support from the DFG via Sonderforschungsbereich (collaborative research center) SFB925 (subproject B3).
Предметные рубрики: SPIN-ORBIT TORQUE
FIELD
ANISOTROPY
MAGNETISM
Аннотация: Chiral magnetism that manifests in the existence of skyrmions or chiral domain walls offers an alternative way for creating anisotropies in magnetic materials that might have large potential for application in future spintronic devices. Here we show experimental evidence for an alternative type of in-plane exchange-bias effect present at room temperature that is created from a chiral 90∘ domain wall at the interface of a ferrimagnetic-ferromagnetic Dy-Co/Ni-Fe bilayer system. The chiral interfacial domain wall forms due to the exchange coupling of Ni-Fe and Dy-Co at the interface and the presence of Dzyaloshinskii-Moriya interaction in the Dy-Co layer. As a consequence of the preferred chirality of the interfacial domain wall, the sign of the exchange-bias effect can be reversed by changing the perpendicular orientation of the Dy-Co magnetization. The chirality-created tunable exchange bias in Dy-Co/Ni-Fe is very robust against high in-plane magnetic fields (μ0H≤6T) and does not show any aging effects. Therefore, it overcomes the limitations of conventional exchange-bias systems.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Rudenko V. V., Ovchinnikov S. G., Molokeev M. S.
Заглавие : Electron Paramagnetic Resonance of Cr3+ Ions in ABO(3) (A = Sc, In, Ga) Diamagnetic Crystals
Место публикации : J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 6. - P.1067-1073. - ISSN 1063-7761, DOI 10.1134/S1063776118120245. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 14
Предметные рубрики: SPIN-RESONANCE
PAIRS
ANISOTROPY
VBO3
Аннотация: A magnetic resonance method is applied to the investigation of a number of isostructural diamagnetic compounds ABO3 (A = Sc, In, and Ga) with small additions of Cr3+ ions (S = 3/2) sufficient to observe single-ion and pair spectra. It is shown that the resonance spectra for isolated Cr3+ ions can be described to a good accuracy by the ordinary axial spin Hamiltonian for 3d ions in octahedral oxygen environment. The parameters of the spin Hamiltonian are determined for single Cr3+ ion and Cr3+–Cr3+ pair. Lattice distorsions of the parent ABO3 crystals caused by the Cr3+ impurities is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanov A. A., Orlov V. A.
Заглавие : Self-organization of the magnetization in ferromagnetic nanowires
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН , RFBR [14-02-00238-a]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2017. - Vol. 440. - P.217-220. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2016.12.053. - ISSN 1873-4766(eISSN)
Примечания : Cited References:21. - This study was supported by RFBR, Project no. 14-02-00238-a
Предметные рубрики: SYSTEM
ANISOTROPY
Ключевые слова (''Своб.индексиров.''): domain wall--nanowire--magnetic inhomogeneities--stochastic domains
Аннотация: In this work we demonstrate the occurrence of the characteristic spatial scale in the distribution of magnetization unrelated to the domain wall or crystallite size with using computer simulation of magnetization in a polycrystalline ferromagnetic nanowire. This is the stochastic domain size. We show that this length is included in the spectral density of the pinning force of domain wall on inhomogeneities of the crystallographic anisotropy. The constant and distribution of easy axes directions of the effective anisotropy of stochastic domain, are analytically calculated.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Ovchinnikov S. G., Rudenko V. V., Vorotynova O. V.
Заглавие : Electron paramagnetic resonance of Cr3+ ions in ABO3 (A = Sc, Lu, In) diamagnetic crystals
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 122, Is. 4. - P.734-737. - ISSN 1063-7761, DOI 10.1134/S1063776116040087. - ISSN 1090-6509(eISSN)
Примечания : Cited References:11
Предметные рубрики: Spin-resonance
Pairs
Anisotropy
CrBO3
VBO3
Аннотация: A magnetic resonance method is applied to the investigation of a number of isostructural diamagnetic compounds ABO3 (A = Sc, Lu, In) with small additions of Cr3+ ions (S = 3/2) sufficient to observe single-ion spectra. It is shown that the resonance spectra for isolated Cr3+ ions can be described to a good accuracy by the ordinary axial spin Hamiltonian for 3d ions in octahedral oxygen environment. The parameters of the spin Hamiltonian are determined. It is established that Cr3+ ions in these crystals are characterized by easy-axis-type anisotropy.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Bykova L. E., Yakovchuk V. Yu., Zhigalov V. S., Volochaev M. N., Matsynin A. A., Tambasov I. A., Seredkin V. A., Patrin G. S., Bondarenko G. N.
Заглавие : Structural and magnetic features of solid-phase transformations in Mn/Bi and Bi/Mn films
Место публикации : JETP Letters. - 2016. - Vol. 103, Is. 4. - P.254-259. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364016040111
Примечания : Cited References: 47. - This work was supported by the Russian Foundation for Basic Research (project nos. 15-02-00948 and 16-03-00069), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. SP-317.2015.1), and by the Foundation for Promotion of the Development of Small Scientific and Engineering Enterprises (project nos. 0011727 and 6662GU2015, program Umnik). The electron microscopy studies were performed on the equipment of the Shared Usage Center, Krasnoyarsk Research Center, Siberian Branch, Russian Academy of Sciences.
Предметные рубрики: High-temperature synthesis
Epitaxial thin-films
State synthesis
Martensitic transformations
Vacuum depositions
MnBi filmsd
Bi
System
Anisotropy
Compound
Аннотация: Solid-phase transformations at different annealing temperatures in Mn/Bi (Mn on Bi) and Bi/Mn (Bi on Mn) films have been studied using X-ray diffraction, electron microscopy, and magnetic measurements. It has been shown that the synthesis of the α-MnBi phase in polycrystalline Mn/Bi films begins at a temperature of ~120°C and the Mn and Bi layers react completely at 300°C. The resulting α-MnBi(001) samples have a large perpendicular magnetic anisotropy (Ku ≃ 1.5 × 107 erg/cm3) and a coercive force H HC ~ 3 kOe. In contrast to Mn/Bi, the ferromagnetic α-MnBi phase in Bi/Mn films is not formed even at annealing processes up to 400°C and Mn clusters are formed in a Bi melt. This asymmetry in phase transformations occurs because chemosorbed oxygen existing on the surface of the Mn film in Bi/Mn films suppresses a solid-phase reaction between Mn and Bi. The analysis of the results obtained implies the existence of new low-temperature (~120°C) structural transformation in the Mn–Bi system. © 2016, Pleiades Publishing, Inc.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Babitskii A. N., Belyaev B. A., Boev N. M., Skomorokhov G. V., Izotov A. V., Galeev R. G.
Заглавие : A magnetometer of weak quasi-stationary and high-frequency fields on resonator microstrip transducers with thin magnetic fields
Место публикации : Instrum. Exp. Tech.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 59, Is. 3. - P.425-432. - ISSN 00204412 (ISSN), DOI 10.1134/S0020441216030131
Примечания : Cited References: 23. - This study was performed within the framework of the State Job of the Ministry of Education and Science of the Russian Federation for the research at the Siberian Federal University in 2014 (project no. 3.528.2014K).
Предметные рубрики: Ferromagnetic-resonance
Films
Susceptibility
Anisotropy
Sensors
Trends
Аннотация: A high-sensitivity magnetometer for simultaneous measurements of three components of a weak quasi-stationary or high-frequency magnetic-field vector was developed and investigated. Microstrip structures that are based on irregular resonators serve as the magnetometer transducers. An anisotropic thin-film magnetic structure is used as the sensing element. This structure consists of two thin magnetic films that are prepared by magnetron sputtering of a Ni75Fe25 permalloy target and separated by a silicon monoxide layer. It is demonstrated that the transducer exhibits the maximum sensitivity, when the easy magnetization axis of the film structure is orthogonal to the polarization direction of the pumping microwave magnetic field in the microstrip resonator and at an optimal value of a constant magnetic bias field and its optimal deflection from the pumping-field polarization direction which is parallel to it. The magnetometer is characterized by a wide dynamic range of measured magnetic fields, 10–10–10–4 Т, and a wide frequency range, 10–1–105 Hz. © 2016, Pleiades Publishing, Inc.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Izotov A. V., Solovev P. N.
Заглавие : Growth simulation and structure analysis of obliquely deposited thin films
Коллективы : Ministry of Education and Science of the Russian Federation [A3.528.2014K]
Место публикации : Russ. Phys. J.: Springer, 2016. - Vol. 59, Is. 2. - P.301-307. - ISSN 1064-8887, DOI 10.1007/s11182-016-0771-2. - ISSN 1573-9228(eISSN)
Примечания : Cited References:27. - This work was supported in part by State Assignment for R&D A3.528.2014K of Ministry of Education and Science of the Russian Federation to Siberian Federal University in 2014.
Предметные рубрики: GLANCING ANGLE DEPOSITION
EVAPORATION
ANISOTROPY
Ключевые слова (''Своб.индексиров.''): oblique angle deposition--simulation of film growth--monte carlo method
Аннотация: Based on the Monte Carlo method, a model of growth of thin films prepared by oblique angle deposition of particles is constructed. The morphology of structures synthesized by simulation is analyzed. To study the character of distribution of microstructural elements (columns) in the film plane, the autocorrelation function of the microstructure and the fast Fourier transform are used. It is shown that with increasing angle of particle incidence, the film density monotonically decreases; in this case, anisotropy arises and monotonically increases in the cross sections of columns, and the anisotropy of distribution of columns in the substrate plane also increases.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Effective refractive index of a quasi-two-dimensional polydomain film of a conjugated polymer
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 1. - P.160-163. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416010042
Примечания : Cited References: 20
Предметные рубрики: THIN POLYFLUORENE FILMS
OPTICAL-CONSTANTS
LOCAL-FIELD
ANISOTROPY
ORDER
Аннотация: The relation between the effective ordinary refractive index n* = (n o n e )1/2 of a quasi-two-dimensional polydomain uniaxial film of a conjugated polymer F8BT in the visible transparency region and the refractive indices (n o,e ) of uniaxial domains with the optical axes randomly oriented in the plane of the film has been confirmed experimentally. The permissible interval of variations in n* has been established and a strong spectral dispersion of this interval near the long-wavelength electronic absorption band of the film has been demonstrated.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Poperechny I. S., Krasikov A. A., Shaikhutdinov K. A., Dubrovskiy A. A., Popkov S. I., Balaev A. D., Yakushkin S. S., Bukhtiyarova G. A., Martyanov O. N., Raikher, Yu. L.
Заглавие : Dynamic magnetization of ε-Fe2O3 in pulse field: Evidence of surface effect
Место публикации : J. Appl. Phys.: American Institute of Physics, 2015. - Vol. 117, Is. 6. - Ст.063908. - ISSN 0021, DOI 10.1063/1.4907586. - ISSN 10897550(eISSN)
Примечания : Cited References:30. - The work was supported by RFBR Grant Nos. 14-02-96002 and 12-02-00897, and project MIG S26/617 from the Ministry of Education and Science of Perm Region.
Предметные рубрики: FERROMAGNETIC-RESONANCE
COERCIVE FIELD
NANOPARTICLES
ANISOTROPY
Аннотация: The magnetization dynamics of ε-Fe2O3 nanoparticles with an average size of about 9 nm is investigated. From comparison of the hysteresis loops obtained in quasi-static conditions and under pulse fields with amplitudes up to 200 kOe and pulse lengths 8–32 ms, it follows that the effective coercivity increases considerably with the variation rate of the imposed magnetic field. A theoretical explanation of this behavior is proposed. The model takes into account the superparamagnetic effects as well as the fact that magnetic anisotropy of the nanoparticles, along with the bulk term, includes a surface contribution. The latter, being of minor importance for the observed magnetic behavior of 25–100 nm particles, becomes essential when the particle size is below 10 nm. From the experimental data, a reference value of the surface anisotropy of nanodisperse ε-Fe2O3 is established, and evidence is presented to the effect that below 300 K this contribution does not significantly depend on temperature.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Aksenov S. V., Ulanov E. A.
Заглавие : Quantum transport through a multilevel magnetic structure with multiple inelastic scattering in a magnetic field taken into account
Коллективы : Program of the Presidium of RAS "Quantum mesoscopic and disordered systems"; Russian Foundation for Basic Research [13-02-00523, 13-02-98013, 14-02-31280], Russian Federation [MK-526.2013.2, SP-6361.2013.5]
Место публикации : Low Temp. Phys.: American Institute of Physics, 2015. - Vol. 41, Is. 2. - P.98-105. - ISSN 1063, DOI 10.1063/1.4913204. - ISSN 10906517(eISSN)
Примечания : Cited References:33. - This work was supported by the Program of the Presidium of RAS "Quantum mesoscopic and disordered systems" and Russian Foundation for Basic Research (Grant Nos. 13-02-00523, 13-02-98013, and 14-02-31280).One of the authors (S.V.A.) is grateful to the grant of the President of the Russian Federation MK-526.2013.2 and the scholarship of the President of the Russian Federation SP-6361.2013.5 for the support.
Предметные рубрики: SINGLE-MOLECULE
SPECTROSCOPY
ATOM
ANISOTROPY
Аннотация: We present a solution for the problem of quantum electron transport through a magnetic atom adsorbed inside a break junction with paramagnetic metal electrodes. In agreement with experimental data, it was assumed that the conduction electrons experience inelastic scattering by the adsorbate due to s–d(f)-exchange interaction. The Keldysh technique was employed to obtain a general expression describing a current through the multilevel structure at finite temperatures in terms of the nonequilibrium Green's function. The use of the atomic representation allowed to exactly account for the non-equidistant structure of the energy spectrum of a magnetic atom and to simplify substantially the application of the Wick theorem for construction of the nonequilibrium diagrammatic technique for the Hubbard operators. The calculation of the current-voltage characteristics of the magnetic adatom in the tunnel regime at low temperatures revealed the presence of regions with a negative differential conductance in a magnetic field.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Bykova L. E., Zhigalov V. S., Tambasov I. A., Bondarenko G. N., Matsynin A. A., Rybakova A. N.
Заглавие : Solid-state synthesis, structural and magnetic properties of CoPd films
Коллективы : Russian Foundation for Basic Research [15-02-00948]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 5. - P.1014-1022. - ISSN 1063, DOI 10.1134/S1063783415050236. - ISSN 10906460(eISSN)
Примечания : Cited References:57. - This study was supported in part by the Russian Foundation for Basic Research (project no. 15-02-00948).
Предметные рубрики: HIGH-TEMPERATURE SYNTHESIS
EPITAXIAL THIN-FILMS
CENTERED-CUBIC CO
MARTENSITIC TRANSFORMATIONS
PHASE SYNTHESIS
SINGLE-CRYSTAL
FE FILMS
CO/PD MULTILAYERS
RECORDING MEDIA
ANISOTROPY
Аннотация: The results of the investigation of the structural and magnetic properties of CoPd films with equiatomic composition have been presented. The films have been synthesized by vacuum annealing of polycrystalline Pd/Co and epitaxial Pd/α-Co(110) and Pd/β-Co(001) bilayer samples. It has been shown that, for all samples, the annealing to 400°C does not lead to the mixing of layers and the formation of compounds. A further increase in the annealing temperature results in the formation of a disordered CoPd phase at the Pd/Co interface, which is fully completed after annealing at 650°C. The epitaxial relationships between the disordered CoPd phase and the MgO(001) substrate are determined as follows: CoPd(110)〈1¯11|| MgO(001)〈100〉 and CoPd(001)[100] || MgO(001)[100], which are formed in the Pd/αCo(110) and Pd/βCo(001) films, respectively. According to the calculations, the first magnetocrystalline anisotropy constants of the disordered CoPd phase for Pd/αCo(110) and Pd/βCo(001) samples have close values: = –(1.6 ± 0.4) × 105 erg/cm3. A possible mechanism of the solidstate synthesis of the CoPd alloy is proposed.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Platunov M. S., Knyazev Yu. V., Ivanova N. B., Zubavichus Y. V., Veligzhanin A. A., Vasiliev A. D., Bezmaternykh L. N., Bayukov O. A., Arauzo A., Bartolome J., Lamonova K. V., Ovchinnikov S. G.
Заглавие : Crystal and local atomic structure of MgFeBO4,Mg0.5Co0.5FeBO4, and CoFeBO4: effects of Co substitution
Место публикации : Phys. Status Solidi B. - 2015. - Vol. 252, Is. 10. - P.2245-2258. - ISSN 0370, DOI 10.1002/pssb.201552143. - ISSN 15213951 (eISSN)
Примечания : Cited References: 46. - This work has been financed by the MECOM Project MAT11/23791, and DGA IMANA project E-34, Council for Grants of the President of the Russian Federation (project nos. NSh-2886.2014.2, SP-938.2015.5), and Russian Foundation for Basic Research (project nos. 13-02-00958-a, 13-02-00358-a, 14-02-31051-mol-a). The work of one of the coauthors (M.S.P.) was supported by the program of Foundation for promoting the development of small enterprises in scientific and technical sphere ("UMNIK" program).
Предметные рубрики: SPIN-GLASS BEHAVIOR
MAGNETIC WARWICKITES
SINGLE-CRYSTALS
PHASE-RELATIONS
OXYBORATE
SYSTEM
SPECTROSCOPY
ANISOTROPY
MN2OBO3
FE2OBO3
Ключевые слова (''Своб.индексиров.''): crystal structure--xanes--exafs--magnetic semiconductor--oxyborate
Аннотация: Single-crystalline MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4 have been grown by the ﬂux method. The samples have been characterized by X-ray spectral analysis, X-ray diffraction, and X-ray absorption spectroscopy. The X-ray absorption near-edge structure (XANES) and extended X-ray absorption ﬁne structure (EXAFS) spectra have been measured at the Fe and Co K-edges over a wide temperature range (6.5– 300 K). The composition, the charge state, and local environ- ment of both Fe and Co atoms have been determined. The effects of Co substitution for Mg on the local structural distortions have been revealed experimentally and the M–O bond anisotropy has been found.Монокристаллические образцы CoFeBO4 были выращены раствор-расплавным методом. Образцы были охарактеризованы с помощью рентгеноспектрального анализа, рентгеновской дифракции и спектроскопии поглощения рентгеновских лучей. Спектры вблизи K-края поглощения рентгеновского излучения структуры (XANES) и далее рентгеновского поглощения тонкой структуры (EXAFS) были измерены для Fe и Co в широком диапазоне температур (6.5- 300К). Состав, состояние заряда, и локальная положение и Fe и Co атомов были определены. Эффекты замещения Co магнием Mg на местные структурные искажения были выявлены экспериментально и анизотропия связи М-О была найдена.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Effective refractive index of a two-dimensional polycrystal
Место публикации : JETP Letters. - 2015. - Vol. 101, Is. 10. - P.685-689. - ISSN 0021-3640, DOI 10.1134/S0021364015100033
Примечания : Cited References: 28
Предметные рубрики: SPECTROSCOPIC ELLIPSOMETRY
CONJUGATED POLYMERS
LOCAL-FIELD
FILMS
CONDUCTIVITY
POLYFLUORENE
ANISOTROPY
DISPERSION
MEDIA
Аннотация: A relation of the effective refractive index of a two-dimensional polycrystalline dielectric film in the transparency region to the refractive indices n1 and n2 of crystallites at the positions of axes 1 and 2, respectively, of refraction ellipsoids of the crystallites in the plane of the film has been obtained. This relation and the relation L* = (L1 + L2)/2 between the components of the Lorentz tensors for the film and crystallites have been confirmed by comparison with experimental data for conjugate-polymer films with uniaxial domains.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zaitsev A. I., Aleksandrovsky A. S., Kozhukhov A. S., Pokrovsky L. D., Atuchin V. V.
Заглавие : Growth, optical and microstructural properties of PbB4O7 plate crystals
Коллективы : SB RAS [28.14, 43.14]; President of the Russian Federation for the support of leading scientific schools [SS-4828.2012.2]; PSB RAS [2.5.2]; Ministry of Education and Science of the Russian Federation
Место публикации : Opt. Mater.: Elsevier Science, 2014. - Vol. 37. - P.298–301. - ISSN 0925-3467, DOI 10.1016/j.optmat.2014.06.012. - ISSN 1873-1252
Примечания : Cited References: 42. - This study is supported by SB RAS via Projects 28.14 and 43.14, and the Grant of the President of the Russian Federation for the support of leading scientific schools SS-4828.2012.2 and by PSB RAS, Grant 2.5.2. V.V.A. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for financial support
Предметные рубрики: LEAD TETRABORATE
SINGLE-CRYSTAL
SUSCEPTIBILITIES
ANISOTROPY
STRONTIUM
SURFACES
RAMAN
Ключевые слова (''Своб.индексиров.''): pbb4o7--czochralski growth--facet--rheed--afm
Аннотация: Centimeter-sized optical quality plate-like PbB4O7 crystals have been grown by Czochralski method. The fundamental absorption edge has been found at 237 nm (corresponding bandgap 5.75 eV) with the distinct sideband protruding up to 300 nm. The crystals are well faceted with the (100), (010) and (101) planes, (100) surfaces being mostly developed. The etching in diluted nitric acid (5 wt.%) at the temperature of 90 °C have been used to reveal the defect structure and remove melt residuals. The (100) surface shows the presence of etching pits and twin boundaries. The Kikuchi line pattern and developed microrelief with the roughness of ~8 nm have been observed by RHEED and AFM, respectively.
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