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Synthesis and magnetic properties of the core-shell Fe3O4/CoFe2O4 nanoparticles / D. A. Balaev, S. V. Semenov, A. A. Dubrovskii [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 2. - P. 285-290, DOI 10.1134/S1063783420020043. - Cited References: 37. - This study was supported by the Russian Science Foundation, project no. 17-12-01111. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
MOSSBAUER
ENSEMBLE
Кл.слова (ненормированные):
oxide nanoparticles -- core-shell structure -- coercivity
Аннотация: The Fe3O4/CoFe2O4 nanoparticles with a core-shell structure with an average size of 5 nm have been obtained by codeposition from the iron and cobalt chloride solutions. An analysis of the magnetic properties of the obtained system and their comparison with the data for single-phase Fe3O4 (4 nm) and CoFe2O4 (6 nm) nanoparticles has led to the conclusion about a noticeable interaction between the soft magnetic (Fe3O4) and hard magnetic (CoFe2O4) phases forming the core and shell of hybrid particles.

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Публикация на русском языке Синтез и магнитные свойства наночастиц Fe3O4/CoFe2O4 со структурой ядро/оболочка [Текст] / Д. А. Балаев, С. В. Семенов, А. А. Дубровский [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 2. - С. 235-240

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Popkov, S. I.; Попков, Сергей Иванович; Yakushkin, S. S.; Kirillov, V. L.; Mart'yanov, O. N.; Russian Science FoundationRussian Science Foundation (RSF) [17-12-01111]
}
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Bolyachkin, A. S.
Power-law behavior of coercivity in nanocrystalline alloys with grain-size distribution / A. S. Bolyachkin, S. V. Komogortsev // 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. J.P3. - P. 195-196. - Cited References: 4 . - ISBN 978-5-9500855-7-4

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Ural Federal University n.a. the first President of Russia B.N. Yeltsin

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Komogortsev, S. V.; Комогорцев, Сергей Викторович; 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"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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General regularities and differences in the behavior of the dynamic magnetization switching of ferrimagnetic (CoFe2O4) and antiferromagnetic (NiO) nanoparticles / S. I. Popkov, A. A. Krasikov, S. V. Semenov [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 9. - P. 1518-1524, DOI 10.1134/S1063783420090255. - Cited References: 46. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk region, and the Krasnoyarsk Regional Foundation for Science, project no. 18-42-240012: "Magnetization switching of magnetic nanoparticles in strong pulsed magnetic fields is a new approach to studying the dynamic effects related to the processes of magnetization of magnetic nanoparticles" . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
PARTICLE-SIZE
   EXCHANGE-BIAS
   TEMPERATURE
   STATE
   COERCIVITY
Кл.слова (ненормированные):
CoFe2O4nanoparticles -- antiferromagnetic NiO nanoparticles -- dynamic magnetization switching -- coercive force
Аннотация: In antiferromagnetic (AFM) nanoparticles, an additional ferromagnetic phase forms and leads to the appearance in AFM nanoparticles of a noncompensated magnetic moment and the magnetic properties typical of common FM nanoparticles. In this work, to reveal the regularities and differences of the dynamic magnetization switching in FM and AFM nanoparticles, the typical representatives of such materials are studied: CoFe2O4 and NiO nanoparticles with average sizes 6 and 8 nm, respectively. The high fields of the irreversible behavior of the magnetizations of these samples determine the necessity of using strong pulsed fields (amplitude to 130 kOe) to eliminate the effect of the partial hysteresis loop when studying the dynamic magnetic hysteresis. For both types of the samples, coercive force HC at the dynamic magnetization switching is markedly higher than HC at quasi-static conditions. HC increases as the pulse duration τP decreases and the maximum applied field H0 increases. The dependence of HC on field variation rate dH/dt = H0/2τP is a unambiguous function for CoFe2O4 nanoparticles, and it is precisely such a behavior is expected from a system of single-domain FM nanoparticles. At the same time, for AFM NiO nanoparticles, the coercive force is no longer an unambiguous function of dH/dt, and the value of applied field H0 influences more substantially. Such a difference in the behaviors of FM and AFM nanoparticles is caused by the interaction of the FM subsystem and the AFM “core” inside AFM nanoparticles. This circumstance should be taken into account when developing the theory of dynamic hysteresis of the AFM nanoparticles and also to take into account their practical application.

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Публикация на русском языке Общие закономерности и различия в поведении динамического перемагничивания ферримагнитных (CoFe2O4) и антиферромагнитных (NiO) наночастиц [Текст] / С. И. Попков, А. А. Красиков, С. В. Семенов [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 9. - С. 1354-1360

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Boreskov Inst Catalisis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Krasikov, A. A.; Красиков, Александр Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Yakushkin, S. S.; Kirillov, V. L.; Mart'yanov, O. N.; Balaev, D. A.; Балаев, Дмитрий Александрович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk region; Krasnoyarsk Regional Foundation for Science [18-42-240012]
}
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Features of the pulsed magnetization switching in a high-coercivity material based on ε-Fe2O3 nanoparticles / S. I. Popkov, A. A. Krasikov, S. V. Semenov [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 3. - P. 445-453, DOI 10.1134/S1063783420030166. - 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." . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE
   WAVE ABSORBER
   OXIDE
   FIELD
   TRANSITION
   RESONANCE
Кл.слова (ненормированные):
ε-Fe2O3 nanoparticles -- dynamic magnetization switching -- coercivity
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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Публикация на русском языке Особенности импульсного перемагничивания высококоэрцитивного материала на основе наночастиц ε-Fe2O3 [Текст] / С. И. Попков, А. А. Красиков, С. В. Семенов [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 3. - С. 395-402

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Krasnoyarsk Sci Ctr, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Krasikov, A. A.; Красиков, Александр Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Yakushkin, S. S.; Kirillov, V. L.; Mart'yanov, O. N.; Balaev, D. A.; Балаев, Дмитрий Александрович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Krai; Krasnoyarsk Territorial Foundation [18-42-240012]
}
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Dynamic magnetization switching in NiO nanoparticles: Pulsed field magnetometry study / D. A. Balaev [et al.] // J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 2. - P. 405–411, DOI 10.1007/s10948-018-4726-4. - Cited References: 32. - We are grateful to Yu.V. Knyazev, S.V. Semenov, and M.I. Kolkov for their help and to M.N. Volochaev for the TEM measurements. TEM studies were performed on the facility of Resource Sharing Center of Krasnoyarsk Scientific Center of Siberian Branch of Russian Academy of Sciences. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project no. 17-42-240138. . - ISSN 1557-1939
Кл.слова (ненормированные):
NiO nanoparticles -- Pulsed field magnetization -- Coercivity
Аннотация: The dynamic magnetization switching of antiferromagnetic nickel oxide nanoparticles with a characteristic size of 8 nm has been experimentally investigated by pulsed field magnetometry. It is shown that, due to the presence of defects in NiO nanoparticles, as in other antiferromagnetic particles, the uncompensated magnetic moment is induced by the incomplete compensation of spins at the antiferromagnetic ordering. The dynamic magnetic hysteresis loops have been studied in pulsed fields with the maximum field (Hmax) of up to 130 kOe and pulse lengths (τP) of 4, 8, and 16 ms. According to the results obtained, the coercivity (HC) depends on both the τP and Hmax values. The observed increase in the HC value with decreasing pulse length (i.e., with increasing switching field frequency) is unambiguously related with the relaxation processes typical of single-domain ferromagnetic nanoparticles. However, the observed effect of the maximum applied field (Hmax) on the HC value is assumed to be a feature of antiferromagnetic nanoparticles.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Boreskov Institute of Catalysis, Russian Academy of Sciences, Siberian Branch, Novosibirsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Balaev, A. D.; Балаев, Александр Дмитриевич; Popkov, S. I.; Попков, Сергей Иванович; Kirillov, V. L.; Martyanov, O. N.
}
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Bolyachkin, A. S.
Power-law behavior of coercivity in nanocrystalline magnetic alloys with grain-size distribution / A. S. Bolyachkin, S. V. Komogortsev // Scripta Mater. - 2018. - Vol. 152. - P. 55-58, DOI 10.1016/j.scriptamat.2018.04.008. - Cited References: 36. - This work was supported by RFBR (research project No. 17-302-50015), by MES of RF (contract No. 3.6121.2017/8.9) and by Act 211 Government of RF (agreement 02.A03.21.0006). . - ISSN 1359-6462
Кл.слова (ненормированные):
Soft magnetic materials -- Random magnetic anisotropy model -- Exchange interaction
Аннотация: Coercivity of nanocrystalline magnetic alloys depends on the grain size D according to a power law Hc ∝ Dn with n from 2 to 6. The law Hc ∝ D6 is derived based on the random magnetic anisotropy model and is clearly manifested in experimental studies of some Finemet type alloys. In this letter using computer modeling it is demonstrated that a power-law behavior with the exponent n less than 6 can be due to a grain-size distribution. An increase of grain size variance results in a decrease of the exponent from 6 to the value of about 3.

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Держатели документа:
Ural Federal University, Yekaterinburg, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович
}
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Thickness dependences of coercivity in three layer films obtained by chemical deposition / A. V. Chzhan [et al.] // J. Phys. Conf. Ser. - 2019. - Vol. 1389, Is. 1. - Ст. 012118, DOI 10.1088/1742-6596/1389/1/012118. - Cited References: 14 . - ISSN 1742-6588. - ISSN 1742-6596
Аннотация: The change of the coercivity Hc of three-layer films obtained by chemical deposition depending on the thickness of the nonmagnetic interlayers and magnetic layers are presented. Structures with magnetically identical soft layers, as well as with significantly different HC values were investigated. It was established that in both cases thecoercivity decreases with the interlayer thickness increasing by an exponential law. It is consistent with a change in the displacement field of the hysteresis loop. The observed changes in the parameters of the hysteresis loop are associated with the roughness of the interfaces.

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Держатели документа:
Siberian Federal University, 660041 Krasnoyarsk, avenue Svobodny 79 Russian Federation
Krasnoyarsk State Agrarian University, 660049 Krasnoyarsk, avenue Mira 90, Russian Federation
Kirensky Institute of Physics FIC KNC SB of the RAS, 660036 Krasnoyarsk, Akademgorodok 50, building number 38, Russian Federation

Доп.точки доступа:
Chzhan, A. V.; Podorozhnyak, S. A.; Shahov, A. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
}
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Temperature-dependent magnetization reversal in exchange bias NiFe/IrMn/NiFe structures / C. Gritsenko [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 482. - P. 370-375, DOI 10.1016/j.jmmm.2019.03.044. - 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. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
COERCIVITY
   FILM
   ROUGHNESS
   THICKNESS
   HEADS
   IRMN
Кл.слова (ненормированные):
Magnetization reversal -- Exchange bias -- Permalloy
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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Держатели документа:
Immanuel Kant Baltic Fed Univ, A Nevskogo 14, Kaliningrad 236041, Russia.
Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Leninskie Gory 1, Moscow 119991, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akad Gorodok 50-38, Krasnoyarsk 660036, Russia.
Natl Univ Sci & Technol MISiS, Leninsky Prospect 4, Moscow 119049, Russia.
Lomonosov Moscow State Univ, Fac Phys, Leninskie Gory 1-2, Moscow 119991, Russia.
Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.
Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan.
Tohoku Univ, Ctr Sci & Innovat Spintron, Sendai, Miyagi 9808577, Japan.

Доп.точки доступа:
Gritsenko, C.h.; Dzhun, I.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Gorshenkov, M.; Babaytsev, G.; Chechenin, N.; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Tretiakov, Oleg A.; Rodionova, V.; 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]
}
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Comparison of the microstructure and magnetic properties of films and composite powders based on 3-D metal / L. A. Chekanova, N. A. Shepeta, E. A. Denisova [et al.] // J. Supercond. Novel Magn. - 2022. - Vol. 35, Is. 11. - P. 3241-3247, DOI 10.1007/s10948-022-06339-w. - Cited References: 19. - This work was funded by the Russian Foundation for Basic Research, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20–43-240003 . - ISSN 1557-1939
Кл.слова (ненормированные):
Composition modulated materials -- Multilayer films -- Composite powders -- Anisotropy field -- Coercivity -- Electroless deposition
Аннотация: The comparison between the magnetic properties of materials with different curvature and spatial distribution of nanograins, such as particles (3D spatial distribution) and multilayer films (2D) was carried out. Functionally graded Co(P)/Ni(P) and Co(P)/CoNi(P) specimens have been fabricated by electroless deposition. The magnetic and structural properties are characterized by electron microscopy, X-ray diffraction, ferromagnetic resonance spectroscopy, and vibrating sample magnetometer. It was demonstrated that the interaction between the Ni(P) core and Co(P) shell of particles could form the functionally graded materials with tailored structure and coercive force. Furthermore, it was found that the magnetic parameters (the local anisotropy field, ferromagnetic resonance linewidth, and coercivity) are mainly determined by the artificially created interface boundaries for all grains’ spatial distribution. The magnetic anisotropy field and coercivity of Co(P)/Ni(P) flat films were characterized by lower values than those for spherical shell of particles with the same composition, produced by the same method.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Krasnoyarsk Railway Transport Institute, Branch of Irkutsk State Transport University, Krasnoyarsk, Russian Federation
Federal Research Center “Krasnoyarsk Science Center, Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Chekanova, L. A.; Чеканова, Лидия Александровна; Shepeta, N. A.; Denisova, E. A.; Денисова, Елена Александровна; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Kuzovnikova, L. A.; Nemtsev, I. V.; Немцев, Иван Васильевич
}
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10.

Magnetic properties of three-dimensional metal rods with composition gradients produced by electroless deposition / E. A. Denisova, L. A. Chekanova, S. V. Komogortsev [et al.] // IEEE Magn. Lett. - 2022. - Vol. 13. - Ст. 6103405, DOI 10.1109/LMAG.2022.3163015. - Cited References: 30. - This work was supported in part by the Russian Foundation for Basic Research (RFBR), Krasnoyarsk Territory and in part by the Krasnoyarsk Regional Fund of Science under Grant 20-43-240003. 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 equipment. Sergey V. Komogortsev thank the RFBR, Krasnoyarsk Region and the Krasnoyarsk Regional Science Foundation (Project 20-42-240001) for the support in the contribution of numerical simulation. The authors also thank V. S. Plotnikov and V. V. Tkachev for electron microscopy images . - ISSN 1949-307X
Кл.слова (ненормированные):
nanomagnetics -- rods with gradients of composition -- electroless deposition -- coercivity -- magnetic anisotropy
Аннотация: A comparative study of the magnetic properties of arrays of Co–Ni rods with different composition gradients (smooth or step-like) along the rod axes was carried out. Ordered arrays of Co–Ni nanorods with diameters up to 400 nm and 8 µm length were prepared by electroless plating into a porous nuclear-track-etched polycarbonate membrane. The gradient in Co and Ni composition was confirmed by energy-dispersive X-ray analysis. The variation of Co–Ni contents along the long axis of the rods correlates with the gradient of the magnetization within the rod. Magnetization reversal was studied by analyzing the angular dependence of coercivity and using micromagnetic simulations. For both types of gradient rods, reversal occurs by curling. The local magnetic anisotropy field of rods with a step-type gradient is significantly higher than that for rods with a smooth gradient.

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Держатели документа:
Federal Research Center Ksc Sb Ras, Kirensky Institute Of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Reshetnev Siberian State University Of Science And Technology, Krasnoyarsk, 660037, Russian Federation
Federal Research Center Ksc Sb Ras, Krasnoyarsk Scientific Center, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Chekanova, L. A.; Чеканова, Лидия Александровна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Satsuk, S. A.; Сацук, Светлана Александровна; Nemtsev, I. V.; Немцев, Иван Васильевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Semenov, S. V.; Семёнов, Сергей Васильевич
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