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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Petrakovskaya E. A., Isakova V. G., Velikanov D. A., Isakov V.
Заглавие : Electron Magnetic Resonance in nanoparticles of 3-d and 5-d metals formation in nanocarbon powders
Коллективы : "Магнитный резонанс для будущего", Международный конгресс, "Euromar", International Conference
Место публикации : EUROMAR 2008 Conference: St.Peterbsburg, 2008, [6-11 July]. - 2008. - p224
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Zharkov S. M., Pankrats A. I., Vorotynov A. M., Tugarinov V. I., Ivantsov R. D., Petrov D. A., Velikanov D. A., Lin C. -R., Chen C. -C., Tseng Y. -T., Hsu H. -S.
Заглавие : Electron spin resonance in Cu1−xFexCr2Se4 nanoparticles synthesized with the thermal decomposition method
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2017. - Vol. 436. - P.21-30. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2017.04.006
Примечания : Cited References: 34. - The paper was partially supported by the President of Russia (Grant #NSh-7559.2016.2). We also thank the Ministry of Science and Technology of Taiwan, Taiwan, and the Siberian Branch of RAS, Russian Federation (MOST 102-2112-M-153-002-MY3) for the financial support.
Ключевые слова (''Своб.индексиров.''): anisotropy--association reactions--chromium compounds--decomposition--electrospinning--inorganic compounds--magnetic moments--magnetocrystalline anisotropy--nanoparticles--plates (structural components)--resonance--spin dynamics--synthesis (chemical)--temperature distribution--thermolysis--inter-particle interaction--nanoparticle (nps)--resonance spectrum--single-crystalline--temperature behavior--temperature decrease--temperature dependence--thermal decomposition methods--electron spin resonance spectroscopy
Аннотация: IIn this paper, we present a study of the electron spin resonance (ESR) of nanoparticles (NPs) of Cu1−xFexCr2Se4 chalcogenides with x = 0, 0.2, and 0.4. NPs were synthesized via the thermal decomposition of metal chloride salts and selenium powder in a high-temperature organic solvent. According to the XRD and HRTEM data, the NPs were single crystalline nearly hexagonal plates with the structure close to CuCr2Se4 (Fd-3m, a = 10.337 Å). For x = 0 and 0.2, the NPs tend to form long stacks consisting of the plates “face to face” attached to each other due to the magnetostatic interparticle interaction. Only separate NPs were observed in the case of x = 0.4. Peculiarities were revealed in the ESR temperature behavior for the NPs with x = 0 and 0.2 consistent with the features in the temperature dependences of the NPs magnetization. The non-monotonous dependence of the resonance field Hres on the temperature with a kink near 130 K and the energy gap in the resonance spectrum depending on the type of nanoparticle compacting are the distinct peculiarities. One of the main factors is discussed in order to explain the peculiarities: the coexistence of two types of anisotropy in the Cu1−xFexCr2Se4 NPs, in-plain shape anisotropy and magnetocrystalline anisotropy with four easy axes, which increases strongly with the temperature decrease.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kliava J., Marbeuf A., Edelman I. S., Ivanova O. S., Petrakovskaja E. A., Ivantsov R. D.
Заглавие : EMR spectra of borat glasses containing two types of transition ion simultaneously
Коллективы : "Магнитный резонанс для будущего", Международный конгресс, "Euromar", International Conference
Место публикации : EUROMAR 2008 Conference: St.Peterbsburg, 2008, [6-11 July]. - 2008. - p221
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Polukhin D. S.
Заглавие : Crossing resonance of stochastically interacting wave fields
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2013. - Vol. 116, Is. 2. - P.206-222. - ISSN 1063-7761, DOI 10.1134/S1063776113020118
Примечания : Cited References: 42. - We are grateful to V. V. Val'kov and A. F. Sadreev for useful discussions. This work was supported by the Presidium of the Russian Academy of Sciences (Program no. 24.29), the Dynasty Foundation (Program for Support of Young Scientists), the Federal Target Program (state contract no. 14.B37.21.0730), and the Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation.
Предметные рубрики: CRYSTALS
SYSTEMS
ALLOYS
MEDIA
Аннотация: The dynamic susceptibilities (Green's functions) of the system of two interacting wave fields of different physical natures with a stochastically inhomogeneous coupling parameter between them with zero mean value have been examined. The well-known self-consistent approximation taking into account all diagrams with noncrossing correlation/interaction lines has been generalized to the case of stochastically interacting wave fields. The analysis has been performed for spin and elastic waves. The results obtained taking into account the processes of multiple scattering of waves from inhomogeneities are significantly different from those obtained for this situation earlier in the Bourret approximation [R.C. Bourret, Nuovo Cimento 26, 1 (1962)]. Instead of frequencies degeneracy removal in the wave spectrum and the splitting of resonance peaks of dynamic susceptibilities, a wide single-mode resonance peak should be observed at the crossing point of the unperturbed dispersion curves. The fine structure appears at vertices of these wide peaks in the form of a narrow resonance on the Green's-function curve of one field and a narrow antiresonance on the vertex of the Green's-function curve of the other field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Polukhin D. S.
Заглавие : Crossing resonance of wave fields in a medium with an inhomogeneous coupling parameter
Место публикации : J. Exp. Theor. Phys. - 2013. - Vol. 117, Is. 5. - P.846-861. - ISSN 1063-7761, DOI 10.1134/S1063776113130049
Аннотация: The dynamic susceptibilities (Green's functions) of the system of two coupled wave fields of different physical natures in a medium with an arbitrary relation between the mean value É and rms fluctuation ΔÉ of the coupling parameter have been examined. The self-consistent approximation involving all diagrams with noncrossing correlation lines has been developed for the case where the initial Green's function of the homogeneous medium describes the system of coupled wave fields. The analysis has been performed for spin and elastic waves. Expressions have been obtained for the diagonal elements G mm and G uu of the matrix Green's function, which describe spin and elastic waves in the case of magnetic and elastic excitations, and for the off-diagonal elements G mu and G um, which describe these waves in the case of cross excitation. Change in the forms of these elements has been numerically studied for the case of one-dimensional inhomogeneities with an increase in ΔÉ and with a decrease in É under the condition that the sum of the squares of these quantities is conserved: two peaks in the frequency dependences of imaginary parts of G mm and G uu are broadened and then joined into one broad peak; a fine structure appears in the form of narrow resonance at the vertex of the Green's function of one wave field and narrow antiresonance at the vertex of the Green's function of the other field; peaks of the fine structure are broadened and then disappear with an increase in the correlation wavenumber of the inhomogeneities of the coupling parameter; and the amplitudes of the off-diagonal elements vanish in the limit É → 0.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Polukhin D. S.
Заглавие : Magnetoelastic resonance in media with the inhomogeneous coupling parameter
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.105-108. - DOI 10.4028/www.scientific.net/SSP.215.105. - ISSN 1662-9779
Примечания : Cited References: 8
Ключевые слова (''Своб.индексиров.''): elastic waves--green's functions--inhomogeneities--magnetoelastic coupling--self-consistent approximation--spin waves
Аннотация: The matrix Green's function of coupled spin and elastic waves for media with the 3D inhomogeneities of the coupling parameter is studied. It has been shown that the difference in shapes of the Green's functions for the cases of 1D and 3D inhomogeneities appears only for the sufficiently large correlation wave number of the inhomogeneities. © (2014) Trans Tech Publications, Switzerland.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Spin-wave resonance in gradient ferromagnets with a parabolic barrier of magnetic parameters
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 1. - Ст.B.O6. - P.150-151. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 6. - The work was partially supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project No 18-42-243005 ”Synthesis and investigation of magnetic properties of gradient materials that are characterized by predetermine type of the magnetic parameter change”
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Shiyan Ya. G., Chzhan A. V., Podorozhnyak S. A.
Заглавие : Influence of interface anisotropy on ferromagnetic resonance in CoP/(NiP)am/CoP films
Коллективы : State order of the Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0011]
Место публикации : Mater. Res. Express. - 2021. - Vol. 8, Is. 5. - Ст.056102. - ISSN 2053-1591(eISSN), DOI 10.1088/2053-1591/abfcf5
Примечания : Cited References: 22. - This work was supported by the State order of the Ministry of Science and Higher Education of the Russian Federation (topic No. FSRZ-2020-0011)
Предметные рубрики: MAGNETIC-ANISOTROPY
MULTILAYERS
Аннотация: The paper presents the results of ferromagnetic resonance studies of three-layer magnetic films, where the magnetic layers are amorphous magnetically soft CoP layers, and the intermediate non-magnetic spacer is amorphous NiP layer. We found that, regardless of the nonmagnetic layer thickness, the interlayer interaction is ferromagnetic. Perpendicular anisotropy forms at the interface between the CoP and NiP layers. It is reasonable to suppose that the interlayer interaction is long-range, what is not typical for systems with metallic non-magnetic spacers.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Chekanova L. A., Vazhenina I. G.
Заглавие : Spin-wave resonance in [Co x Ni1-x]N and [Co x P1-x ]N gradient films
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2013. - Vol. 77, Is. 10. - P.1265-1267. - ISSN 1062-8738, DOI 10.3103/S1062873813100110
Аннотация: Gradient films of ferromagnetic 3d metals with prescribed magnetic potential profile along the film thickness are obtained. It is found that the spin-wave resonance spectrum in these films is characterized by anomalous dependences of resonance fields of spin-wave modes H r on the mode number: H r(n) ? n, H r(n) ? n 2/3. В© 2013 Allerton Press, Inc.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Shestakov V. A., Togushova Yu.N.
Заглавие : Spin resonance peak in Fe-based superconductors with unequal gaps
Коллективы : RFBR [16-02-00098]; Government Support of the Leading Scientific Schools of the Russian Federation [NSh-7559.2016.2]
Место публикации : Phys. Rev. B: American Physical Society, 2016. - Vol. 94, Is. 9. - Ст.094517. - ISSN 2469-9950, DOI 10.1103/PhysRevB.94.094517. - ISSN 2469-9969(eISSN)
Примечания : Cited References:41. - We would like to thank H. Kontani, S. A. Kuzmichev, T. E. Kuzmicheva, V. M. Pudalov, and I. S. Sandalov for useful discussions. M.M.K. is grateful to B. Keimer and the Max Planck Institut fur Festkorperforschung for their hospitality during his visit. We acknowledge partial support by RFBR (grant 16-02-00098) and by Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2).
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTIVITY
IRON-BASED SUPERCONDUCTORS
Аннотация: We study the spin resonance in the superconducting state of iron-based materials within multiband models with two unequal gaps, Delta(L) and Delta(S), on different Fermi-surface pockets. We show that, due to the indirect nature of the gap entering the spin susceptibility at the nesting wave vector Q, the total gap (Delta) over tilde in the bare susceptibility is determined by the sum of gaps on two different Fermi-surface sheets connected by Q. For the Fermi-surface geometry characteristic of most iron pnictides and chalcogenides, the indirect gap is either (Delta) over tilde = Delta(L) + Delta(S) or (Delta) over tilde = 2 Delta(L). In the s(++) state, spin excitations below (Delta) over tilde are absent unless additional scattering mechanisms are assumed. The spin resonance appears in the s(+/-) superconducting state at frequency omega(R)
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