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1.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Orlov V. A., Patrin G. S., Orlova I. N.
Заглавие
: Dynamics of
magnetization
in an array of three-layer nanodiscs
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.D.P13. - P.385-386. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания
: Cited References: 2. - The research is done with the financial support of the Russian Foundation for Basic Research in the framework of Project No. 18-02-00161
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2.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Mukhin A. A., Ivanov V. Yu., Tikhanovskii A. Yu., Gudim I. A.
Заглавие
: Effect of electric field on
magnetization
and magnetic susceptibility in rare-earth ferroborite multiferroics
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. 2. - Ст.K.O8. - P.312-313. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания
: Cited References: 3. - This work was supported by the Russian Science Foundation (project 16-12-10531)
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3.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Izotov A. V., Belyaev B. A.
Заглавие
: New approach to determine equilibrium
magnetization
in magnetic nanostructures
Коллективы
: "Trends in Nanomechanics and Nanoengineering", workshop, Сибирский федеральный университет, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации
: Workshop "Trends in Nanomechanics and Nanoengineering" : book of abstracts/ предс. сем. K. S. Aleksandrov ; зам. предс. сем.: G. S. Patrin, S. G. Ovchinnikov ; чл. лок. ком.: N. N. Kosyrev, A. S. Fedorov [et al]. - 2009. - P.25
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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Orlov V. A., Patrin G. S., Orlova I. N.
Заглавие
: Dynamics of
magnetization
in an array of three-layer nanodiscs
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism"
Место публикации
: J. Phys. Conf. Ser. - 2019. - Vol. 1389, Is. 1. - Ст.012005. - ISSN 1742-6588,
DOI
10.1088/1742-6596/1389/1/012005. - ISSN 1742-6596 (eISSN)
Примечания
: Cited References: 27. - The reported study was funded by RFBR according to the research project no. 18-02-00161.
Аннотация:
The paper studies associated motion of magnetic vortices in a triple-layer FM/NM/FM disc array. The connection of magnetic layers'
magnetization
inside of one disc and between the discs is assured by magnetostatic interaction. The frequencies of magnetic vortex resonant motion have been calculated analytically and resonant curves for the arrays with different alternation of magnetic vortex polarity and chirality have been constructed. It has been shown that despite of a small value of the core magnetic moments, taking their interaction into account leads to a small but significant splitting of the resonant frequency.
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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Dubrovskiy A. A., Semenov S. V., Knyazev Yu. V., Popkov S. I., Yakushkin S., Kirillov V., Martyanov O., Balaev D. A.
Заглавие
: The Low-Temperature Magnetic State and Magnetic Ordering Temperature of ϵ-Fe2O3 Iron Oxide Nanoparticles
Место публикации
: IEEE Magn. Lett. - 2019. - Vol. 10. - Ст.6110103. - ISSN 1949307X (ISSN),
DOI
10.1109/LMAG.2019.2956674
Примечания
: Cited References: 22
Предметные рубрики:
Magnetic resonance
Magnetic hysteresis
Temperature distribution
Saturation
magnetization
Nanoparticles
Perpendicular magnetic anisotropy
Аннотация:
The ϵ-Fe2O3 iron oxide polymorph is a well-known magnetic material with a complex magnetic structure, which undergoes a series of magnetic transitions in different temperature ranges. However, the ϵ-Fe2O3 phase diagram is still unclear. We report on the magnetic properties of a sample consisting of ϵ-Fe2O3 nanoparticles with an average size of 8 nm embedded in a SiO2 xerogel matrix without an admixture of foreign phases. Along with the features typical of the well-known ϵ-Fe2O3 magnetic transition in the temperature range 80–150 K, the temperature dependence of
magnetization
M(T) of ϵ-Fe2O3 includes other low-temperature anomalies. In an external field of H = 70 kOe, there is a noticeable temperature hysteresis of
magnetization
at 50–90 K, and near T ≈ 50 K, the M(T) curves have a characteristic bending, which may be indicative of an additional magnetic transition. The ferromagnetic resonance spectra shows that, near 500 K, a magnetic phase transition occurs, which was previously thought to be a transition to the paramagnetic state. An analysis of the temperature dependence of the ferromagnetic resonance spectra shows that the magnetically ordered phase in ϵ-Fe2O3 exists up to about 800 K.
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6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Krainova G. S., Il’in N. V., Plotnikov V. S., Chekanova L. A., Nemtsev I. V., Yurkin G. Yu., Iskhakov R. S., Yatmanov D. A.
Заглавие
: Features of the ferromagnetic resonance of amorphous FeSiBNbCu ribbons with different compositions
Место публикации
: Inorg. Mater.: Appl. Res. - 2020. - Vol. 11, Is. 1. - P.177-180. - ISSN 20751133 (ISSN),
DOI
10.1134/S2075113320010219
Примечания
: Cited References: 25
Аннотация:
The resonance microwave absorption in amorphous FeSiBNbCu ribbons with different compositions obtained by rapid quenching from the melt has been investigated. It is shown that the effective
magnetization
calculated from the resonance field linearly decreases with increasing boron and copper impurity concentrations and the total number of nonmagnetic impurity atoms in the iron-based FeSiBNbCu ribbons.
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7.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Dzebisashvili D. M., Khudaiberdyev A. A.
Заглавие
: Quantum oscillations of
magnetization
in the antiferromagnetic semimetals on triangular lattice
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.C.O4. - P.254. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания
: Cited References: 4. - This work was financially supported by the Russian Foundation for Basic Research (RFBR) (project No. 18-02-00837)
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8.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Denisova E. A., Chekanova L. A., Neznakhin D. S., Nemtsev I. V., Fel'k V. A., Iskhakov R. S.
Заглавие
:
Magnetization
curves of ferromagnetic microtubes
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.C.P18. - P.301. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания
: Cited References: 2. - Support by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project № 18-42-240006 is acknowledged.
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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Izotov A. V., Belyaev B. A., Solovev P. N., Boev N. M.
Заглавие
: Numerical calculation of high frequency magnetic susceptibility in thin nanocrystalline magnetic films
Место публикации
: Physica B. - 2018. - Vol. 556. - P.42-47. - ISSN 0921-4526,
DOI
10.1016/j.physb.2018.12.006. - ISSN 1873-2135 eISSN
Примечания
: Cited References: 32. - This work was supported by the Ministry of Education and Science of the Russian Federation, №RFMEFI60417X0179.
Предметные рубрики:
Physics, Condensed Matter
Ключевые слова
(''Своб.индексиров.''): micromagnetic simulation--
magnetization
dynamics--magnetic susceptibility--ferromagnetic resonance--nanocrystalline film--soft magnetic film
Аннотация:
Two numerical micromagnetic methods most suitable for calculation of the high frequency magnetic susceptibility of nanocrystalline thin films were considered in detail. The methods are based on the Landau–Lifshitz equation, linearized around the equilibrium state leading to an eigenvalue problem or solved using an undetermined coefficients technique. An analysis and estimation of an efficiency of the methods were carried out. Several conclusions about their advantages and shortcomings, as well as specifics of their practical application were drawn.
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10.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Gritsenko, C.h., Dzhun I., Volochaev M. N., Gorshenkov M., Babaytsev G., Chechenin N., Sokolov A. Е., Tretiakov, Oleg A., Rodionova V.
Заглавие
: Temperature-dependent
magnetization
reversal in exchange bias NiFe/IrMn/NiFe structures
Коллективы
: Russian Foundation for Basic Research (RFBR) [17-32-50170]; MEXT, Japan [17 K05511, 17H05173]; Center for Science and Innovation in Spintronics (Core Research Cluster), Tohoku University; JSPS; RFBR under the Japan-Russian Research Cooperative Program; Ministry of Education and Science of the Russian Federation [3.9002.2017/6.7]
Место публикации
: J. Magn. Magn. Mater. - 2019. - Vol. 482. - P.370-375. - ISSN 0304-8853,
DOI
10.1016/j.jmmm.2019.03.044. - ISSN 1873-4766(eISSN)
Примечания
: Cited References: 55. - Ch. G. and M. G. acknowledge financial support by the Russian Foundation for Basic Research (RFBR grant. 17-32-50170). Ch. G. acknowledges the 5 top 100 Russian Academic Excellence Project at the Immanuel Kant Baltic Federal University. O.A.T. acknowledges support by the Grants-in-Aid for Scientific Research (Grant Nos. 17 K05511 and 17H05173) from MEXT, Japan, by the grant of the Center for Science and Innovation in Spintronics (Core Research Cluster), Tohoku University, by JSPS and RFBR under the Japan-Russian Research Cooperative Program. V.R. acknowledges the Ministry of Education and Science of the Russian Federation in the framework of government assignment 3.9002.2017/6.7. Electron microscopy examination was carried out at the Center for Collective Use of the Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences. We also thank Montserrat Rivas for helpful discussions.
Предметные рубрики:
COERCIVITY
FILM
ROUGHNESS
THICKNESS
HEADS
IRMN
Аннотация:
We demonstrate
magnetization
reversal features in NiFe/IrMn/NiFe thin-film structures with 40% and 75% relative content of Ni in Permalloy in the temperature range from 80 K to 300 K. The
magnetization
reversal sequence of the two ferromagnetic layers is found to depend on the type of NiFe alloy. In the samples with 75% relative content of Ni, the bottom ferromagnetic layer reverses prior to the top one. On the contrary, in the samples with 40% of Ni, the top ferromagnetic layer reverses prior to the bottom one. These tendencies of
magnetization
reversal are preserved in the entire range of temperatures. These distinctions can be explained by the morphological and structural differences of interfaces in the samples based on two types of Permalloy.
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11.
Вид документа
: Статья из сборника (выпуск монографической серии)
Шифр издания
:
Автор(ы)
: Zhuravlev V., Nevmyvaka A., Itin V., Velikanov D. A.
Заглавие
: Mechanochemical synthesis of hexagonal ferrites BaFe12O19
Коллективы
: International Conference on Radiation-Thermal Effects and Processes in Inorganic Materials
Место публикации
: Key Eng. Mater. - 2018. - Vol. 781 KEM. - P.119-124. - ,
DOI
10.4028/www.scientific.net/KEM.781.119
Примечания
: Cited References: 15
Ключевые слова
(''Своб.индексиров.''): ferromagnetic resonance--
magnetization
curve--magnetocrystalline anisotropy--mechanochemical synthesis--nanostructure hexaferrites
Аннотация:
The phase composition, structural parameters, and basic magnetic characteristics of BaFe12O19 hexaferrites prepared by the mechanochemical synthesis with subsequent annealing at a temperature of 1000°С and 1100°С for 1 h are investigated. The influence of the annealing temperature on the properties of synthesized materials is analyzed. Values of the saturation
magnetization
and the anisotropy field are determined. It is established that annealing temperature in the interval 1000 - 1100 °C does not significantly affect on the phase composition and the size of nanoparticles. The value of the anisotropy field increases substantially with increasing temperature.
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12.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Gokhfel'd D. M., Komogortsev S. V., Altin S.
Заглавие
:
Magnetization
loops of MgB2 + Co composite tape
Коллективы
: Байкальская Международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Восточно-сибирская государственная академия образования, Иркутский государственный университет
Место публикации
: Магнитные материалы. Новые технологии" : тезисы докладов: тез. докл. V Байкал. междунар. конф. BICMM-2012/ чл. прогр. ком. R. S. Iskhakov. - Иркутск, 2012. - Ст.O-10. - С. 13. - ISBN 978-5-85827-756-9
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Комогорцев, Сергей Викторович, Крайнова Г. С., Ильин Н. В., Плотников В. С., Чеканова, Лидия Александровна, Немцев, Иван Васильевич, Юркин, Глеб Юрьевич, Исхаков, Рауф Садыкович, Ятманов Д. А.
Заглавие
: Особенности ферромагнитного резонанса лент аморфных сплавов FeSiBNbCu различного состава
Место публикации
: Материаловедение. - 2019. - № 7. - С. 8-11. - ISSN 1684-579X,
DOI
10.31044/1684-579X-2019-0-7-8-11
Примечания
: Библиогр.: 25
Аннотация:
Исследовано резонансное поглощение СВЧ-волн в аморфных лентах FeSiBNbCu различного состава, полученных быстрой закалкой из расплава. Для величины эффективной намагниченности, рассчитанной по величине резонансного поля, наблюдается линейное снижение с ростом концентрации примеси бора, меди, а также суммарного количества атомов немагнитной примеси в лентах сплава FeSiBNbCu на основе железа.The resonance absorption of microwaves in amorphous FeSiBNbCu tapes of different compositions, prepared by rapid quenching from a melt has been studied. A linear decrease in effective
magnetization
with increasing boron, copper, and a total nonmagnetic impurity concentration in the FeSiBNbCu iron-based alloy tapes was observed.
РИНЦ
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14.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Kazak N. V., Sofronova S. N., Knyazev Yu. V., Bovina A. F., Seryotkin Yu. V., Gavrilkin S. Yu., Eremin E. V., Bezmaternykh L. N., Ovchinnikov S. G., Chernyshov A. V.
Заглавие
: Negative
magnetization
of the Ni5.33Ta0.67B2O10 crystals
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.G.P11. - P.580-581. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Popkov S. I., Krasikov A. A., Velikanov D. A., Kirillov V. L., Martyanov O. N., Balaev D. A.
Заглавие
: Formation of the magnetic subsystems in antiferromagnetic NiO nanoparticles using the data of magnetic measurements in fields up to 250 kOe
Место публикации
: J. Magn. Magn. Mater. - 2019. - Vol. 483. - P.21-26. - ISSN 03048853 (ISSN) ,
DOI
10.1016/j.jmmm.2019.03.004
Примечания
: Cited References: 76. - We are grateful S.V. Semenov and A.A. Dubrovskiy for their help, S.V. Komogortsev and A.D. Balaev for fruitful discussions, and M.N. Volochaev for the TEM measurements. The TEM investigations were carried out on the equipment of the Center of Collective Use of the Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”.The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: «Magnetic reversal of magnetic nanoparticles in strong pulsed magnetic fields - a new approach to the study of dynamic effects associated with the
magnetization
of magnetic nanoparticles» (project no. 18-42-240012).
Ключевые слова
(''Своб.индексиров.''): antiferromagnetic nanoparticle--external magnetic field--low temperature regions--magnetic subsystems--magnetically actives--
magnetization
curves--paramagnetic subsystems--pulsed magnetic fields--magnetic bubbles
Аннотация:
It is well-known that the fraction of surface atoms and the number of defects in an antiferromagnetic particle increase with a decrease in the particle size to tens of nanometers, which qualitatively changes the properties of the particle. Specifically, in antiferromagnetic nanoparticles, spins in the ferromagnetically ordered planes can partially decompensate; as a result, an antiferromagnetic particle acquires a magnetic moment. As a rule, uncompensated chemical bonds of the surface atoms significantly weaken the exchange coupling with the antiferromagnetic particle core, which can lead to the formation of an additional magnetic subsystem paramagnetic at high temperatures and spin-glass-like in the low-temperature region. The existence of several magnetic subsystems makes it difficult to interpret the magnetic properties of antiferromagnetic nanoparticles. It is shown by the example of NiO nanoparticles with an average size of 8 nm that the correct determination of the contributions of the magnetic subsystems forming in antiferromagnetic nanoparticles requires magnetic measurements in much stronger external magnetic fields than those commonly used in standard experiments (up to 60–90 kOe). An analysis of the
magnetization
curves obtained in pulsed magnetic fields up to 250 kOe allows one to establish the contributions of the uncompensated particle magnetic moment μun, paramagnetic subsystem, and antiferromagnetic particle core. The μun value obtained for the investigated NiO particles is consistent with the Néel model, in which μun ∼ N1/2 (N is the number of magnetically active atoms in a particle), and thereby points out the existence of defects on the surface and in the bulk of a particle. It is demonstrated that the anomalous behavior of the high-field susceptibility dM/dH of antiferromagnetic NiO nanoparticles, which was observed by many authors, is caused by the existence of a paramagnetic subsystem, rather than by the superantiferromagnetism effect.
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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Iskhakov R. S., Fel'k V. A.
Заглавие
: Fractal Dimension Effect on the
Magnetization
Curves of Exchange-Coupled Clusters of Magnetic Nanoparticles
Коллективы
: Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [18-42-240006]
Место публикации
: J. Exp. Theor. Phys. - 2019. - Vol. 128, Is. 5. - P.754-760. - ISSN 1063-7761,
DOI
10.1134/S1063776119040095. - ISSN 1090-6509(eISSN)
Примечания
: Cited References: 54. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund under the research project no. 18-42-240006.
Предметные рубрики:
THIN-FILMS
COERCIVE FORCE
NANOCRYSTALLINE
SATURATION
FERROMAGNETS
Аннотация:
The effect of the fractal dimension of exchange-coupled clusters of magnetic nanoparticles on their
magnetization
curves is predicted by scaling estimates. These predictions form the basis for the experimental technique used for determining the fractal dimension of nanoparticle clusters from the
magnetization
curves. We estimate the reliability of determining the dimension by such methods with the help of micromagnetic simulation. It is shown that the effective dimension of magnetic correlation volumes, which is determined from analysis of the
magnetization
approaching saturation, is in conformity with the dimension of fractal clusters determined from analysis of their morphology. The dimension estimated from analysis of the coercive field on the particle size in a physically natural situation of the dipole-dipole interaction between nanoparticles provides estimates of the cluster dimension, which strongly differs from estimates obtained from analysis of their morphology.
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17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Popkov S. I., Krasikov A. A., Semenov S. V., Dubrovskii A. A., Yakushkin S. S., Kirillov V. L., Mart'yanov O. N., Balaev D. A.
Заглавие
: Features of the pulsed
magnetization
switching in a high-coercivity material based on ε-Fe2O3 nanoparticles
Коллективы
: Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Krai; Krasnoyarsk Territorial Foundation [18-42-240012]
Место публикации
: Phys. Solid State. - 2020. - Vol. 62, Is. 3. - P.445-453. - ISSN 1063-7834,
DOI
10.1134/S1063783420030166. - ISSN 1090-6460(eISSN)
Примечания
: Cited References: 44. - The study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Krai, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 18-42-240012 "
Magnetization
Switching of Magnetic Nanoparticles in Strong Pulsed Magnetic Fields: New Approach to Studying the Dynamic Effects Related to the
Magnetization
of Magnetic Nanoparticles."
Предметные рубрики:
HIGH-TEMPERATURE
WAVE ABSORBER
OXIDE
FIELD
TRANSITION
RESONANCE
Аннотация:
The magnetic structure of the ε-Fe2O3 iron oxide polymorphic modification is collinear ferrimagnetic in the range from room temperature to ~150 K. As the temperature decreases, ε-Fe2O3 undergoes a magnetic transition accompanied by a significant decrease in the coercivity Hc and, in the low-temperature range, the compound has a complex incommensurate magnetic structure. We experimentally investigated the dynamic
magnetization
switching of the ε-Fe2O3 nanoparticles with an average size of 8 nm in the temperature range of 80–300 K, which covers different types of the magnetic structure of this iron oxide. A bulk material consisting of xerogel SiO2 with the ε-Fe2O3 nanoparticles embedded in its pores was examined. The magnetic hysteresis loops under dynamic
magnetization
switching were measured using pulsed magnetic fields Hmax of up to 130 kOe by discharging a capacitor bank through a solenoid. The coercivity Нс upon the dynamic
magnetization
switching noticeably exceeds the Нс value under the quasi-static conditions. This is caused by the superparamagnetic relaxation of magnetic moments of particles upon the pulsed
magnetization
switching. In the range from room temperature to ~ 150 K, the external field variation rate dH/dt is the main parameter that determines the behavior of the coercivity under the dynamic
magnetization
switching. It is the behavior that is expected for a system of single-domain ferro- and ferrimagnetic particles. Under external conditions (at a temperature of 80 K) when the ε-Fe2O3 magnetic structure is incommensurate, the coercivity during the pulsed
magnetization
switching depends already on the parameter dH/dt and is determined, to a great extent, by the maximum applied field Hmax. Such a behavior atypical of systems of ferrimagnetic particles is caused already by the dynamic spin processes inside the ε-Fe2O3 particles during fast
magnetization
switching.
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18.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Balatskiy D. V., Kraynova G. S., Plotnikov V. S., Ilin N. V., Tkachev V. V., Knyazev Yu. V.
Заглавие
: Magnetic Properties of Fe–Cu–Nb–Si–B Spinning Ribbons
Место публикации
: Bull. Russ. Acad. Sci. Phys. - 2020. - Vol. 84, Is. 9. - P.1126-1130. - ISSN 10628738 (ISSN),
DOI
10.3103/S1062873820090063
Примечания
: Cited References: 7
Аннотация:
Dependences of relative saturation
magnetization
on temperature are measured for amorphous nanocrystalline ribbons of Finemet-type FeCu1Nb3Si13.5B8, FeCu1Nb3Si13B6, and FeCu1Nb3Si13B13 compositions. The character of the structural relaxation of amorphous alloys is established by means of Mossbauer spectroscopy, and the main magnetic characteristics are determined. It is found that the structural relaxation of amorphous ribbon proceeds in several stages upon annealing.
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19.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Sofronova S. N., Kazak N. V., Eremin E. V., Moshkina E. M., Chernyshov A. V., Bovina A. F.
Заглавие
:
Magnetization
reversal and sign reversal exchange bias field in polycrystalline Ni5.33Ta0.67B2O10
Место публикации
: J. Alloys Compd. - 2021. - Vol. 864. - Ст.158200. - ISSN 09258388 (ISSN),
DOI
10.1016/j.jallcom.2020.158200
Примечания
: Cited References: 31. - The research was funded by RFBR , Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science , project number 18-42-240007
Аннотация:
The sign reversal of both
magnetization
and exchange bias field was studied in the polycrystalline Ni5.33Ta0.67B2O10. The crystal structure of Ni5.33Ta0.67B2O10 is quasi–low dimensional due to NiO6/TaO6 octahedra forming two dimensional infinite layers. The antiferromagnetic/ferrimagnetic phase transition was observed at TN = 165 K. The negative exchange bias effect was found in the 30–90 K temperature range, whereas the positive exchange bias effect was observed at temperatures below 30 K. We assume that the exchange bias effect is due to different types of magnetic ordering of Ni2+ magnetic moments in two layers.
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20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Izotov A. V., Skomorokhov G. V., Solovev P. N.
Заглавие
: Micromagnetic analysis of edge effects in a thin magnetic film during local excitation of
magnetization
oscillations
Место публикации
: Russ. Phys. J. - 2020. - Vol. 63, Is. 5. - P.837-843. - ISSN 1064-8887,
DOI
10.1007/s11182-020-02106-3. - ISSN 1573-9228(eISSN)
Примечания
: Cited References: 19. - This research was performed with financial support of the Russian Foundation for Basic Research within the research project No. 18-32-00086
Предметные рубрики:
ANISOTROPIES
SIMULATIONS
FIELDS
Аннотация:
The method of numerical micromagnetic simulation was used to study the
magnetization
dynamics of a thin film with uniaxial magnetic anisotropy during ferromagnetic resonance (FMR) excitation in it on the local sites by a linearly polarized high-frequency magnetic field emitted from the 1 mm opening in the metallic screen of the transmission line. It was established that non-uniformities of demagnetizing fields emerging near the film edges lead not only to the change in the FMR field, but also to the change in the value and direction of the uniaxial anisotropy field. The distribution of non-uniformities of the magnetic anisotropy characteristics over the area of 60 nm thick permalloy film that was measured on the scanning FMR spectrometer agrees well with the micromagnetic simulation results. Demagnetizing fields were proved to be the main cause for the edge effects in magnetic films.
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