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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovev P. N., Belyaev B. A., Boev N. M., Skomorokhov G. V., Izotov A. V.
Заглавие : Magnetic anisotropy and ferromagnetic resonance in inhomogeneous demagnetizing fields near edges of thin magnetic films
Колич.характеристики :12 с
Место публикации : J. Phys. Condens. Matter. - 2024. - Vol. 36, Is. 19. - Ст.195803. - ISSN 09538984 (ISSN), DOI 10.1088/1361-648X/ad258c. - ISSN 1361648X (eISSN)
Примечания : Cited References: 38
Аннотация: Using local ferromagnetic resonance spectroscopy, we have studied the magnetic properties near edges of thin tangentially magnetized permalloy films, in which a well-defined uniaxial magnetic anisotropy was induced perpendicular to one of the edges. In the experiment, two samples with thicknesses of 90 and 300 nm and with slightly different compositions were examined. To explain the magnetization dynamics near edges, we propose a simple yet effective model of a film in the form of a rectangular prism, which yields the modified Kittel formula for the resonance frequency. In this formula, the locally averaged distance-dependent demagnetizing field that emerges near the edges is included as an additional uniaxial anisotropy term. The measurements reveal that at a certain distance from the edge, the resulting (apparent) anisotropy, determined from the angular dependencies of the resonance field, almost vanishes. Moreover, its easy axis reorients to become parallel to the edge. The model predictions agree well with these results, proving that the main resonance mode behavior near the film edges can be accurately described by introducing additional effective uniaxial anisotropy, provided the measuring area is relatively large. However, for the thick (300 nm) sample, additional precession modes are also observed. These modes distort the angular dependence of the main mode, thus demonstrating the limitations of the model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova E. A., Chekanova L. A., Komogortsev S. V., Iskhakov R. S., Vazhenina I. G., Nemtsev I. V., Li O. A.
Заглавие : Ferromagnetic resonance and magnetic anisotropy of 3d-metal wires with composition gradients
Колич.характеристики :5 с
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2024. - Vol. 88, Is. 4. - P.531-535. - ISSN 10628738 (ISSN), DOI 10.1134/S1062873823706244. - ISSN 19349432 (eISSN)
Примечания : Cited References: 13
Аннотация: Results are presented from investigating the ferromagnetic resonance spectra of arrays of Co‒Ni and Co‒Fe‒Ni wires with different composition gradients, deposited into polycarbonate track-etched membranes. The effect interfaces and concentration gradients have on the effective fields of the investigated wires is examined. An anomalous angular dependence of the fields of ferromagnetic resonance is observed for the wire arrays at a pore density of ~18% in the membrane.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Li O. A., Vorotynov A. M., Velikanov D. A., Maksimov N. G., Iskhakov R. S., Ladygina V. P., Shokhrina A. O.
Заглавие : Studying the ferromagnetic resonance heating of an isotropic superparamagnet by the example of biogenic ferrihydrite nanoparticles
Колич.характеристики :4 с
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2024. - Vol. 88, Is. 4. - P.536-539. - ISSN 10628738 (ISSN), DOI 10.1134/S106287382370627X. - ISSN 19349432 (eISSN)
Примечания : Cited References: 10
Аннотация: Ferrihydrite nanoparticles are synthesized and characterized. The dependences of heating of powders are studied upon pumping by a high-frequency electromagnetic field on a dc magnetic field. It is shown that the experimental dependence of the temperature of particles on a dc magnetic field is consistent with the theory of ferromagnetic resonance for an isotropic superparamagnet.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Kobyakov A. V., Yushkov V. I., Anisimov I. O., Zharkov S. M., Semenov S. V., Moiseenko, Evgeniy T.
Заглавие : Influence of a thin V2O3 spacer on interlayer interactions in Fe-Ni/V2O3/FeNi film structures
Колич.характеристики :10 с
Место публикации : Processes. - 2023. - Vol. 11, Is. 7. - Ст.2084. - ISSN 22279717 (eISSN), DOI 10.3390/pr11072084
Примечания : Cited References: 25. - The research was conducted according to the state assignment of the Ministry of Science and Higher Education of the Russian Federation and the Federal State Autonomous Educational Institution of Higher Education Siberian Federal University (No. FSRZ-2023-0008)
Аннотация: In this paper, we explore the suggestions of the results of experimental studies on low-dimensional layered systems in FeNi/V2O3/FeNi film structures. The multifunctional material V2O3 is used as an interlayer between the magnetically active FeNi layers. The films were obtained by ultrahigh vacuum magnetron sputtering on a glass substrate with a base size of 10−10 Torr. It has been found that for V2O3 films, the decrease in the metal–semiconductor transition temperature increases significantly. Magnetic characteristics were studied on the MPMS-XL SQUID magnetometer. The exchange effect occurs both in the region where the oxide has a magnetic order and in the paramagnetic region. The latter is due to the effect of the magnetic panel in the oxide package. The phenomenon of oscillation of the exchange field occurs depending on the phenomenon of intermediate observation observed experimentally.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Li O. A., Nikolaeva E. D., Boev N. M., Vorotynov A. M., Velikanov D. A., Iskhakov R. S., Pyankov V. F., Knyazev Yu. V., Bayukov O. A., Shokhrina A. O., Molokeev M. S., Vasiliev A. D.
Заглавие : Heating of magnetic powders in the ferromagnetic resonance mode at a frequency of 8.9 GHz
Колич.характеристики :8 с
Коллективы : Nanophysics and Nanoelectronics, International Symposium
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P.963-970. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.06.56109.21H. - ISSN 10906460 (eISSN)
Примечания : Cited References: 25
Аннотация: Nickel ferrite nanoparticles 4 nm in size were synthesized by chemical deposition. Subsequent annealing at T=700°C for 5 h led to an increase in the particle size to 63 nm. The Mossbauer spectra and the frequency-field dependences of ferromagnetic resonance have been measured. It has been shown that freshly prepared powders are superparamagnetic at room temperature. The kinetic dependences of the heating of nanoparticles in the ferromagnetic resonance mode at a frequency of 8.9 GHz were measured. It was found that the maximum rate of temperature increase in this mode for a ferromagnetic powder is an order of magnitude greater than for the superparamagnetic state (1.2 and 0.13 K/s, respectively). The latter is determined by the saturation magnetization of the studied powders.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vazhenina I. G., Stolyar S. V., Tyumentsev A. V., Volochaev M. N., Iskhakov R. S., Komogortsev S. V., Pyankov V. F., Nikolaeva E. D.
Заглавие : Study of magnetic iron oxide nanoparticles coated with silicon oxide by ferromagnetic method
Колич.характеристики :5 с
Коллективы : Nanophysics and Nanoelectronics, International Symposium
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P.884-888. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.06.56095.01H. - ISSN 10906460 (eISSN)
Примечания : Cited References: 20. - The study was supported by grant No. 22-14-20020 provided by the Russian Science Foundation, Krasnoyarsk Regional Science Foundation
Аннотация: agnetic nanoparticles of magnetite with a size of ~8 nm synthesized with a different type of coating were studied by ferromagnetic resonance in the temperature range from 7 to 300 K. The features of the experimental temperature dependences of the parameters of the ferromagnetic resonance curve (the magnitude of the resonant field, line width and intensity) and their approximation allowed us to estimate the values of characteristic temperatures. Firstly, the value of the Vervey temperature and the dependence of its value on the type of coating were determined. Secondly, the temperature of transition of nanoparticles to the superparamagnetic state (blocking temperature) and the temperature range within which the magnetic structure of the outer shell of the magnetic nanoparticle is in the spin glass state are established.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikov, Grigory Yu., Vazhenina I. G., Iskhakov R. S., Boev N. M., Komogortsev S. V., Svalov, Andrey V., Kurlyandskaya, Galina V.
Заглавие : Magnetic properties of FeNi/Cu-based lithographic rectangular multilayered elements for magnetoimpedance applications
Место публикации : Sensors. - 2023. - Vol. 23, Is. 13. - Ст.6165. - ISSN 14248220 (eISSN), DOI 10.3390/s23136165
Примечания : Cited References: 72. - This research was funded by the Russian Science Foundation (RSF), project no. 22-29-00980, https://rscf.ru/project/22-29-00980/ (accessed on 1 July 2023)Authors acknowledge the possibility to use the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” for ferromagnetic resonance studies. We thank A.A. Yuvchenko and V.N. Lepalovskij for special support. The authors wish to thank the anonymous referees for their comments and suggestions
Аннотация: The rectangular elements in magnetoimpedance (MI) configuration with a specific nanocomposite laminated structure based on FeNi and Cu layers were prepared by lift-off lithographic process. The properties of such elements are controlled by their shape, the anisotropy induced during the deposition, and by effects associated with the composite structure. The characterizations of static and dynamic properties, including MI measurements, show that these elements are promising for sensor applications. We have shown that competition between the shape anisotropy and the in-plane induced anisotropy of the element material is worth taking into account in order to understand the magnetic behavior of multilayered rectangular stripes. A possibility of the dynamic methods (ferromagnetic and spin-wave resonance) to describe laminated planar elements having a non-periodic modulation of both structure and magnetic parameters of a system is demonstrated. We show that the multilayered structure, which was originally designed to prevent the development of a “transcritical” state in magnetic layers and to reach the required thickness, also induces the effects that hinder the achievement of the goal, namely an increase in the perpendicular magnetic anisotropy energy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S., Polukhin D. S.
Заглавие : High-frequency susceptibility of the ferromagnetic resonance in thin films with random one- and two-dimensional inhomogeneities in the magnetic anisotropy
Коллективы : Eurasian Symposium “Trends in Magnetism”
Место публикации : J. Exp. Theor. Phys. - 2023. - Vol. 136, Is. 1. - P.39-45. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776123010041. - ISSN 10906509 (eISSN)
Примечания : Cited References: 26. - This work was supported in part by the Russian Foundation for Basic Research, by the Government of the Krasnoyarsk region, and by the Krasnoyarsk Regional Science Foundation (project no. 20-42-240010)
Аннотация: The effect of random one- (1D) and two-dimensional (2D) inhomogeneities of the magnetic anisotropy on the shape and width of ferromagnetic resonance line in a thin film has been studied in the standard and new self-consistent approximations. It has been shown that resonance peaks in the case of 2D inhomogeneities are much narrower than those for 1D ones. Peaks are asymmetric in both the 1D and 2D cases, but asymmetry is larger in the latter case. As the correlation wavenumber of inhomogeneities kc increases, the width of a resonance line decreases and its amplitude increases. The amplitude of the FMR peak for 2D inhomogeneities increases much faster than that for 1D inhomogeneities. At the critical dimensionless parameter kcd/π ~ 1, where d is the thickness of the film, the width of the resonance line has an inflection point and the asymmetry of this line and the shift of the ferromagnetic resonance peak are maximal. It has been shown that the new self-consistent approximation reproduces the shape of the resonance line much better than the standard self-consistent approximation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Li O. A., Nikolaeva E. D., Vorotynov A. M., Velikanov D. A., Knyazev Yu. V., Bayukov O. A., Iskhakov R. S., P’yankov V. F., Volochaev M. N.
Заглавие : An effective method of magnetic hyperthermia based on the ferromagnetic resonance phenomenon
Место публикации : Phys. Met. Metallogr. - 2023. - Vol. 124, Is. 2. - P.174-180. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X22601834. - ISSN 15556190 (eISSN)
Примечания : Cited References: 15. - This study was supported by grant no. 22-14-20020 from the Russian Science Foundation and the Krasnoyarsk Regional Fund for Support of Scientific and Technological Activities. The authors are grateful to the Krasnoyarsk Regional Center for Collective Use at Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, for providing their research facilities
Аннотация: Nickel and cobalt ferrite nanoparticles have been synthesized using the chemical precipitation method; the nanoparticle sizes were found to be 63 ± 22 and 26 ± 4 nm, respectively. The static hysteresis loops and Mossbauer spectra have been measured. It is shown that cobalt ferrite powders are magnetically harder than nickel ferrite powders. Ferromagnetic resonance (FMR) curves have been studied. It is found that the FMR absorption for cobalt ferrite is observed at room temperature and above. The time dependences of the nanoparticle warm-up under FMR conditions have been measured. The maximum temperature changes for nickel ferrite and cobalt ferrite particles are 8 and 11 K, respectively. Using the example of cobalt ferrite powder, the possibility of effectively heating of particles in the FMR mode in their own field without using a DC magnetic field source is shown. The observed effect can be used in magnetic hyperthermia.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov V. A., Rudenko R. Yu., Luk'yanenko A. V., Yakovchuk V. Yu., Komarov V. A., Prokopenko V. S., Orlova I. N.
Заглавие : Features of the magnetic state of an ordered array of ferromagnetic ribbons
Место публикации : Phys. Met. Metallogr. - 2023. - Vol. 124, Is. 2. - P.109-117. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X22601780. - ISSN 15556190 (eISSN)
Примечания : Cited References: 35. - In the part of sample preparations, this study was supported by the Russian Foundation for Basic Research within research project no. 20-02-00696. The magnetic measurements and theoretical calculations were performed within the framework of State assignment from the Ministry of Science and Higher Education of the Russian Federation (topic no. FSRZ-2020-0011)
Аннотация: The features of the magnetic state of an array of parallel oriented permalloy ribbons are discussed. The arrays are made by explosive lithography. The ribbons have a thickness of 180 nm, a width of 2.8 µm, and a length of about 4 mm. The distance between ribbons in different samples varies in the range from 300 nm to 4 μm. It is found that the ribbons in the regions far from the end faces are in a single-domain state with small-angle ripples, the magnetization distribution of which correlates with inhomogeneities of the ribbon side surfaces. Moreover, there is a distinct relationship in the spatial distribution of the ripples between adjacent ribbons with a relatively small distance between them. This makes it possible to evaluate the role of the magnetostatic coupling of magnetic subsystems of array elements and to estimate the characteristic value of the random stray field that pins the magnetization.
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11.

Вид документа : Однотомное издание
Шифр издания : Описание изобретения к патенту 2797721!-832788964
Автор(ы) : Бурмитских, Антон Владимирович, Подшивалов, Иван Валерьевич, Боев, Никита Михайлович, Горчаковский, Александр Антонович, Клешнина, Софья Андреевна, Крёков, Сергей Дмитриевич, Соловьев, Платон Николаевич, Изотов, Андрей Викторович, Негодеева, Ирина Александровна, Скоморохов, Георгий Витальевич
Заглавие : Измерительная ячейка широкополосного спектрометра ферромагнитного резонанса .-
Коллективы : Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук", Федеральная служба по интеллектуальной собственности (Роспатент), Федеральный институт промышленной собственности
Место публикации : Изобретения. Полезные модели: офиц. бюл. Фед. службы по интеллектуал. собственности (Роспатент). - 2023. - № 16
Аннотация: Изобретение относится к измерительной технике и предназначено для неразрушающего контроля качества магнитных пленок и изученияих высокочастотных характеристик путемрегистрации спектров ферромагнитного резонанса тонкопленочных образцов в широкой полосе частот. Технический результат - повышение верхней рабочей частоты ячейки и упрощение процедуры смены исследуемого образца. Измерительная ячейка широкополосного спектрометра ферромагнитного резонанса содержит короткозамкнутую несимметричную полосковую линию, размещенную в электромагнитном экране, и СВЧ-разъем, расположенный перпендикулярно полосковой линии. Электромагнитным экраном является замкнутый металлический корпус ячейки, с верхней стороны которого расположен СВЧразъем, а в нижней части боковой стороны имеется отверстие для установки исследуемого образца тонкой магнитной пленки в зазор между отрезком несимметричной полосковой линии и экраном, причем размеры отверстия больше габаритных размеров исследуемого образца. 5 ил.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Denisova E. A., Chekanova L. A., Komogortsev S. V., Vazhenina I. G., Iskhakov R. S., Nemtsev I. V.
Заглавие : Ferromagnetic resonance and magnetic anisotropy of 3-d metal rods with gradients of composition
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.135
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Li O. A., Nikolaeva E. D., Vorotynov A. M., Velikanov D. A., Knyazev Yu. V., Bayukov O. A., Iskhakov R. S., Kryukova O. V., Pyankov V. F., Volochaev M. N., Mokhov A. A.
Заглавие : Preparation and properties of magnetic composites γ-Fe2O3/SiO2/aptamer(FAS9) for magnetic resonance hyperthermia
Колич.характеристики :8 с
Место публикации : Phys. Met. Metallogr. - 2023. - Vol. 124, Is. 14. - P.1689-1696. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X23601439. - ISSN 15556190 (eISSN)
Примечания : Cited References: 27
Аннотация: Powders of maghemite γ-Fe2O3 with an average diameter of 8 nm, γ-Fe2O3/SiO2 composites with an agglomerate diameter of about 50 nm and a size of interspersed γ-Fe2O3 particles of 6 nm, and γ‑Fe2O3/SiO2/aptamer(FAS9) composites were synthesized by chemical deposition. Mössbauer spectra were measured, the static and dynamic magnetic properties of the powders were studied, and the coercive force was determined, which decreases from 14 Oe for γ-Fe2O3 powders to 3 Oe for the γ-Fe2O3/SiO2 composite. It is shown that the particle blocking temperature is close to room temperature. The increment of temperature of the powders was measured in the ferromagnetic resonance mode; the temperature of the Fe2O3/SiO2 composite (ΔT ≈ 16°C) turned out to be higher than that of the pure γ-Fe2O3 powder (ΔT ≈ 10°C). It has been experimentally shown that temperature increment ΔT is proportional to the square of the microwave field amplitude. It has been shown that the composition γ-Fe2O3/SiO2/aptamer FAS9 is able to effectively bind to tumor cells, and FMR hyperthermia leads to a decrease in the viability of tumor cells.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov A. S., Lukyanenko A. V., Yakovlev I. A., Tarasov I. A., Bondarev I. A., Sukhachev A. L., Shanidze L. V., Smolyakov D. A., Varnakov S. N., Ovchinnikov S. G., Volkov N. V.
Заглавие : Ferromagnetic silicides and germanides epitaxial films and multilayered hybrid structures: Synthesis, magnetic and transport properties
Колич.характеристики :14 с
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2023. - Vol. 87, Suppl. 1. - P.S133-S146. - ISSN 10628738 (ISSN), DOI 10.1134/S1062873823704518. - ISSN 19349432 (eISSN)
Примечания : Cited References: 54. - The authors thank the laboratory of Magnetic MAX Materials created under Megagrant project (agreement no. 075-15-2019-1886) for providing experimental equipment and the Collective Use Center at the Krasnoyarsk Scientific Center (Siberian Branch, Russian Academy of Sciences) for assistance. The authors also thank Professor B.A. Belyaev for FMR calculationsSupported by the Russian Science Foundation, grant no. 23-22-10033, https://rscf.ru/project/23-22-10033/, Krasnoyarsk Regional Fund of Science
Аннотация: Planar and vertical hybrid structures, which combine ferromagnetic and semiconductor layers are essential for implementation and study of spin transport phenomena in semiconductors, which is crucial for the advancement and development of spintronics. We have developed approaches for the synthesis of Fe3 + xSi1 – x epitaxial thin films and demonstrated the spin accumulation effect in multiterminal devices based on Fe3 + xSi1 – x/Si. Fe3 + xSi1 – x/Ge/Fe3Si and Fe3 + xSi1 – x/Ge/Mn5Ge3 multilayer hybrid structures were synthesized on a Si(111) substrate, study of their structural, magnetic and transport properties were performed. The effect of synthesis conditions on the growth of epitaxial structures and on their magnetic and transport properties was discussed. The results obtained may prove valuable in the development and fabrication of spintronic devices.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Орлов, Виталий Александрович, Патрин, Геннадий Семёнович, Шиян, Ярослав Германович
Заглавие : Ферромагнитный резонанс в многослойных soft/hard/sof пленках
Коллективы : Байкальская международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. IX Байкал. междунар. конф. BICMM-2023/ чл. прогр. ком.: S. S. Aplesnin [et al.] ; чл. орг. ком. R. S. Iskhakov [et al.]. - Иркутск, 2023. - С. 87-89. - ISBN 978-5-962402178-0, DOI 10.26516/978-5-9624-2178-0.2023.1-207
Примечания : Библиогр.: 8
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Столяр, Сергей Викторович, Ли О.А., Николаева Е. Д., Исхаков, Рауф Садыкович, Боев, Никита Михайлович, Шохрина А. О.
Заглавие : Ферромагнитный резонанс в суперпарамагнитных частицах NiFe2O4
Коллективы : Байкальская международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. IX Байкал. междунар. конф. BICMM-2023/ чл. прогр. ком.: S. S. Aplesnin [et al.] ; чл. орг. ком. R. S. Iskhakov [et al.]. - Иркутск, 2023. - С. 47-48. - ISBN 978-5-962402178-0
Примечания : Библиогр.: 4
Материалы конференции,
Материалы конференции,
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Stolyar S. V., Nikolaeva E. D., Vorotynov A. M., Velikanov D. A., Iskhakov R. S., Kryukova O. V., Pyankov V. F., Ladygina V. P., Boev N. M.
Заглавие : Ferromagnetic resonance: a new method for the implementation of magnetic hyperthermia
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.51
Материалы конференции,
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Bykova L. E., Zhigalov V. S., Kokh D., Mikhlin Y. L., Matsynin A. A., Bondarenko G. N.
Заглавие : Solid-state synthesis, structural and magnetic characterization of ferromagnetic phases in 24Ga/76Fe(0 0 1), 40Ga/60Fe(0 0 1) and 60Ga/40Fe(0 0 1) bilayers
Место публикации : J. Magn. Magn. Mater. - 2022. - Vol. 561. - Ст.169709. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2022.169709
Примечания : Cited References: 77. - The work is partially based upon the experiments performed on Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS»
Аннотация: The A2, B2, D03 phases and dispersive nanoprecipitates play key roles in the nature of super-functional properties, such as the large and sensitive magnetostriction, in Fe100-xGax alloys. However, the temperature conditions for the occurrence of the chemical interaction between Fe and Ga, leading to the synthesis of these phases and nanoprecipitates, remain completely unexplored. Herein we first report results of the start of the chemical interaction at the Ga/Fe(0 0 1) interface and the structural and magnetic phase transformations in 24Ga/76Fe(0 0 1), 40Ga/60Fe(0 0 1) and 60Ga/40Fe(0 0 1) bilayers from room temperature to 800 °C. For all bilayers the magnetic ordered D03 phase is the first phase which is formed at the Ga/Fe(0 0 1) interface at ∼ 375 °C. When the annealing temperature is increased above 580 °C in 24Ga/76Fe(0 0 1) samples the epitaxial D03(0 0 1) layer begins to develop into the epitaxial magnetic ordered B2(0 0 1) layer, which remains after annealing to 800 °C. In 40Ga/60Fe(0 0 1) samples the epitaxial D03(0 0 1) layer evolves into the epitaxial B2(0 0 1) layer and a new epitaxial layer with interplanar spacing 0.1484 nm (L60ʹ), which has close reflections with L60 nanoprecipitates. The L60ʹ phase exhibits unique magnetic properties, including a large magnetic fourfold anisotropy constant of ∼ 7·105 erg/cm3 and 8-fold anisotropy. The solid-state reactions in 60Ga/40Fe(0 0 1) samples start with the synthesis of D03 nanograins embedded in amorphous phases, whose peaks are centered on D03(0 0 4) and Fe(0 0 2) reflections. Above 700 °C the amorphous phases partially crystallize and the epitaxial magnetic L60ʹ and ordered B2(0 0 1) phases emerge. Dewetting and unidentified secondary precipitations are observed in all samples and their influence on the magnetic properties is discussed. Our results demonstrate not only the complex nature of initial stage Fe100-xGax alloy synthesis, but also predict the low-temperature transformation at ∼ 375 °C in the Fe - Ga phase diagram.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Vazhenina I. G., Yaroslavtsev R. N., Chekanova L. A., Cheremiskina E., Mikhlin Y.
Заглавие : Magnetic composite coatings FeC and NiC synthesized with arabinogalactan
Место публикации : IEEE Magn. Lett. - 2022. - Vol. 13. - Ст.2503505. - ISSN 1949307X (ISSN), DOI 10.1109/LMAG.2022.3164631
Примечания : Cited References: 23. - This work was supported by Russian Foundation for Basic Research, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science under Project 20-42-240010. The authors thank the Center of Collective Use of the Federal Research Center, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences for the provided equipment
Аннотация: In this work, we investigated the ferromagnetic resonance spectra of metal/carbon composite coatings. FeC and NiC coatings were synthesized by electroless deposition using polysaccharide arabinogalactan. An analysis of the angular dependences of the resonance field showed that the coatings consist of three magnetic phases separated by a nonmagnetic phase of carbon.
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20.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Govorun I. V., Afonin A. O., Ugryumov A. V., Solovev P. N., Leksikov An. A., Boev N. M.
Заглавие : Magnetic frequency doubler
Коллективы : International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices
Место публикации : 23rd IEEE International Conference of Young Professionals in Electron Devices and Materials, EDM 2022: (30 June - 4 July 2022, Altai): IEEE Computer Society, 2022. - Vol. 2022-June. - P.135-139. - , DOI 10.1109/EDM55285.2022.9855072
Примечания : Cited References: 10. - This work was supported by the Russian Science Foundation under Grant No. 19-72-10047. The equipment of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” was used during the measurement
Аннотация: This article presents the compact magnetic frequency doubler based on a quarter-wavelength stepped-impedance microstrip resonator with a 125-nm-thick permalloy (Ni 70 Fe 30 ) magnetic film. For the first time, the implementation of a frequency doubler operating at the high-field peak is shown. To produce a uniform magnetic field in the thin magnetic film plane, the magnetic system consisting of individual permanent magnets and based on the circular Halbach array was developed. The uniformity of the magnetic field in the region of 10×10 mm2 was 4.9%. Two bandpass filters were developed. The input filter serves to purify the input signal from parasitic harmonics. The output filter blocks the input signal in the resonator. The resonator, magnetic system, input and output filters are integrated into a single device. The maximum measured conversion efficiency was 0.97% (at 1 GHz) at the input power of 4800 mW. The −3 dB fractional bandwidth of the magnetic frequency doubler was 2.15%.
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