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Вид документа : Однотомное издание
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : Ultranarrow resonance peaks in the transmission and reflection spectra of a photonic crystal cavity with Raman gain
Место публикации : ArXiv. - 2009. - Ст.0909.0092
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kniazev I.
Заглавие : Magnetic transition study in e-Fe2O3 by conventional Mössbauer spectroscopy and synchrotron radiation source
Коллективы : EBS Workshop on Nuclear Resonance Scattering
Место публикации : NRS workshop: list of posters. - 2019. - Ст.9
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dmitriev A. I., Kulikov A. V., Gilmutdinov I. F., Dremova N. N., Mazitov A. A., Dmitrieva M. S., Alekseev S. I., Myagkov V. G.
Заглавие : Magnetic Anisotropy in Thin Films of FePt Detected by the Ferromagnetic Resonance Method
Коллективы : [007-00160-18-00]
Место публикации : J. Surf. Ingestig. - 2019. - Vol. 13, Is. 2. - P.210-214. - ISSN 1027-4510, DOI 10.1134/S102745101902006X. - ISSN 1819-7094(eISSN)
Примечания : Cited References: 18. - The study was performed under state contract no. 007-00160-18-00. The dependences of the magnetic moment of the samples on the magnetic-field intensity were measured using instruments of the Federal center for shared facilities for the physical-chemical research of compounds and materials at Kazan Federal University.
Ключевые слова (''Своб.индексиров.''): fept thin films--ferromagnetic resonance--magnetic anisotropy
Аннотация: FePt thin films are made via the heat treatment of structures containing Pt (001) and Fe (001) epitaxial layers. X-ray spectral analysis and field-emission scanning electron microscopy show that the samples contain the cubic L12–Fe3Pt phase and the tetragonal L10–FePt phase. The magnetic anisotropy of the thin films is studied by ferromagnetic resonance and magnetometric methods. The contributions from the cubic and tetragonal phases to the ferromagnetic-resonance spectrum of the sample are distinguished. The key characteristics of thin films which determine their practical applicability are determined: the Gilbert damping parameter G ~ 0.4, the first and second crystal anisotropy constants K1⊥ = –4.08 × 106 erg/cm3, K2⊥ = 1.34 × 106 erg/cm3, K2|| = –9.76 × 104 erg/cm3.
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Вид документа : Статья из сборника (выпуск монографической серии)
Шифр издания :
Автор(ы) : Togushova Yu.N., Korshunov M. M.
Заглавие : Role of Interactions in the Energy of the Spin Resonance Peak in Fe-Based Superconductors
Коллективы : International Conference on Solid Compounds of Transition Elements
Место публикации : Solid State Phenomena. - 2019. - Vol. 289 SSP. - P.212-217. - , DOI 10.4028/www.scientific.net/SSP.289.212
Примечания : Cited References: 30. - This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098), Presidium of RAS Program for the Fundamental Studies #12, and “BASIS” Foundation for Development of Theoretical Physics and Mathematics. MMK acknowledges support by the Gosbudget program # 0356-2017-0030.
Предметные рубрики: Solid Compounds of Transition Elements III
Аннотация: We consider the spin response within the five-orbital model for iron-based superconductors and study two cases: equal and unequal gaps in different bands. In the first case, the spin resonance peak in the superconducting state appears below the characteristic energy scale determined by the gap magnitude, 2ΔL. In the second case, the energy scale corresponds to the sum of smaller and larger gap magnitudes, ΔL+ΔS. Increasing the values of the Hubbard interaction and the Hund's exchange, we observe a shift of the spin resonance energy to lower frequencies.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov V. A., Ivanov A. A., Orlova I. N.
Заглавие : On the Effect of Magnetostatic Interaction on the Collective Motion of Vortex Domain Walls in a Pair of Nanostripes
Место публикации : Phys. Status Solidi B. - 2019. - Vol. 256, Is. 10. - Ст.1900113. - ISSN 03701972 (ISSN) , DOI 10.1002/pssb.201900113
Примечания : Cited References: 49. - The reported study was funded by RFBR according to the research project no. 18-02-00161.
Аннотация: The periodic motion of interacting vortex domain walls in a pair of nanostripes has been analytically and numerically investigated. A model consisting of two parallel nanostripes with the domain magnetization structure has been proposed, where domains are separated by vortex walls. The magnetic subsystems of the stripes magnetostatically interact, which causes the existence of normal magnetic vortex motion modes in the latter. Frequencies of the collective magnetization modes have been calculated using empirical expressions for the magnetic energy of interaction between vortex walls. It is shown that not any combinations of the polarity and chirality lead to the resonance magnetization behavior in ac fields. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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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) : Belyaev B. A., Boev N. M., Izotov A. V., Solovev P. N.
Заглавие : Study of Peculiarities of the Microwave Absorption Spectrum of Nanocrystalline Thin Magnetic Films
Коллективы : Ministry of Education and Science of the Russian Federation [RFMEFI60417X0179]
Место публикации : Russ. Phys. J. - 2019. - Vol. 61, Is. 10. - P.1798-1805. - ISSN 1064-8887, DOI 10.1007/s11182-019-01603-4. - ISSN 1573-9228(eISSN)
Примечания : Cited References: 22. - This work was supported by the Ministry of Education and Science of the Russian Federation, project No. RFMEFI60417X0179.
Предметные рубрики: MICROMAGNETIC CALCULATION
SIMULATIONS
PARTICLES
MODES
Ключевые слова (''Своб.индексиров.''): micromagnetic modeling--nanocrystallites--random magnetic anisotropy--ferromagnetic resonance--microwave
Аннотация: Based on the micromagnetic model which takes into account the random distribution of the uniaxial magnetic anisotropy directions in crystallites of a nanocrystalline film, an effective method has been implemented for calculation of the magnetization dynamics in microwave fields. For a certain range of crystallite sizes, when the energy of the random magnetic anisotropy is comparable to the exchange energy, a significant change of the ferromagnetic resonance field, broadening of the resonance line, and the appearance of an asymmetry in the shape of the resonance curve were found. With an increase of the crystallite sizes, the resonance field first grows, then, it quickly decreases to its minimum, and then, it grows again to reach saturation. In this case, the steepness of the left slope of the broadening resonance curve first decreases faster than that of the right slope, leading to the symmetry breaking of the resonance curve shape, then, the curve becomes symmetrical again, and then, the steepness of the left slope becomes greater than that of the right slope.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Izotov A. V., Belyaev B. A., Solovev P. N., Boev N. M.
Заглавие : Two-Magnon Relaxation Processes in Nanocrystalline Thin Magnetic Films
Коллективы : Russian Ministry of Education and Science [3.1031.2017/PCh]
Место публикации : Russ. Phys. J. - 2019. - Vol. 61, Is. 12. - P.2313-2320. - ISSN 1064-8887, DOI 10.1007/s11182-019-01673-4. - ISSN 1573-9228(eISSN)
Примечания : Cited References: 25. - This research was done with support of the Russian Ministry of Education and Science, task No. 3.1031.2017/PCh.
Предметные рубрики: FERROMAGNETIC-RESONANCE LINEWIDTH
MICROMAGNETIC CALCULATION
SCATTERING
Аннотация: Numerical analysis of the micromagnetic model was used to reveal the ‘resonance’ feature of relaxation processes in nanocrystalline thin magnetic films. This feature manifests itself in the form of sharp broadening of the ferromagnetic resonance (FMR) line at a certain frequency f1 depending on magnetic characteristics of the film, and is observed only in films the thickness of which exceeds some threshold value dmin. Sharp broadening of the FMR line is accompanied by significant shift of the resonance field, whereas the shift value changes the sign at frequency ~ f1. It was shown analytically that the nature of observed effects is associated with the two-magnon process of spin waves scattering on quasi-periodic magnetic microstructure – magnetization ‘ripple’. Obtained expressions for the threshold value of film thickness dmin and frequency of maximum broadening of FMR line f1 agree well with the results of numerical computation of micromagnetic model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Buznik V. M., Bespalov A. S., Grashchenkov D. V.
Заглавие : Magnetic Resonance Imaging of Water Absorption by Highly Porous Ceramic Materials
Место публикации : Dokl. Chem. - 2019. - Vol. 484, Is. 2. - P.44-47. - ISSN 00125008 (ISSN), DOI 10.1134/S0012500819020058
Примечания : Cited References: 9. - The studies were performed using equipment of KRTsKP FITs "KNTs SO RAN" in the framework of the program of basic research of the Russian Academy of Sciences (project no. V.44.1.7.) regarding the development of the MRI methodology for studying composite and porous materials, and also supported by the Russian Foundation for Basic Research (project no. 16-29-05334ofi_m "Scientific foundations for creating thin-film coatings with controlled wettability") regarding the development of water-repellent porous materials.
Ключевые слова (''Своб.индексиров.''): magnetic resonance imaging--porosity--ceramic materials--hydrophobic coatings--adsorption--capillary phenomena
Аннотация: A nontrivial character of water absorption in highly porous ceramic materials has been demonstrated for the first time by magnetic resonance imaging: a phenomenon of hygroscopic memory has been detected consisting in the concentration of adsorbed water in certain areas inside the sample, repeated during subsequent wetting with water. It has been shown that hydrophobization of the material by applying fluoro paraffin coatings to oxide fibers using the method of dissolution of fluoropolymers in supercritical CO2 has a significant impact on the transport of water into products and can be considered an efficient means of protecting porous materials from moisture. The results demonstrate the capabilities of the MRI method in studying the water absorption and identifying water migration pathways in highly porous materials.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vazhenina I. G., Chekanova L. A., Iskhakov R. S.
Заглавие : Spin-Wave Resonance Detection of Nanostructured Magnetic Alloy Inhomogeneities, Using the Example of Co–P and Co–Ni Planar Systems
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 6. - P.713-715. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819060364
Примечания : Cited References: 12. - The reported study was funded by the Russian Foundation for Basic Research, the Government of Krasnoyarsk Krai, and the Krasnoyarsk Regional Fund of Science as part of research project no. 18-42-243005 “Synthesis and Investigation of Magnetic Properties of Gradient Materials Characterized by a Predetermined Type of the Magnetic Parameter Change.”
Аннотация: Inhomogeneous layered magnetic thin films of amorphous and nanocrystalline Со–Р and Co–Ni alloys are studied via spin-wave resonance. It is found that the formation of a magnetic potential profile specified over the coating thickness leads to characteristic modifications of the spin-wave resonance spectrum. Another important factor that determines the type of modification is the dominant magnetic parameter (the constant of magnetization or exchange coupling).
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