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Strain-induced charge ordering above room temperature in rare-earth manganites / Yu. Samoshkina, M. Rautskii, D. Neznakhin [et al.] // Dalton Trans. - 2024. - Vol. 53, Is. 12. - P. 5721-5731, DOI 10.1039/D3DT04299E. - Cited References: 52 . - ISSN 1477-9226. - ISSN 1477-9234
Аннотация: Most known mixed manganites containing rare-earth elements demonstrate a pronounced charge ordering (CO) state below room temperature. The behavior of the magnetic susceptibility and electronic magnetic resonance of polycrystalline Pr1−xSrxMnO3/YSZ (x = 0.2 and x = 0.4) films without a pronounced texture indicates the formation of the CO phase in the samples at temperatures close to and above room temperature. Moreover, this phase manifests itself with a typical sign of martensitic transformation.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg 620002, Russia
National University of Science and Technology (NUST “MISIS”), Moscow 119991, Russia
Research and Education Center “Smart Materials and Biomedical Applications”, Immanuel Kant Baltic Federal University, Kaliningrad 236041, Russia
Boreskov Institute of Catalysis, Novosibirsk, 630090, Russia
Moscow Technical University of Communication and Informatics, Moscow 111024, Russia

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Neznakhin, D.; Stepanova, E.; Andreev, N.; Chichkov, V.; Zaikovskii, V.; Chernichenko, A.
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Magnetic circular dichroism of Co nanoparticles localized in matrices of various types / Yu. Samoshkina, I. Edelman, H. Chou [et al.] // Materialia. - 2023. - Vol. 28. - Ст. 101759, DOI 10.1016/j.mtla.2023.101759. - Cited References: 28. - This work was supported by the Russian Science Foundation [grant number 21-72-00061]. Electron microscopic studies were carried out in the laboratory of electron microscopy of the Joint Scientific Center of the Siberian Federal University . - ISSN 2589-1529
Кл.слова (ненормированные):
Co nanoparticles -- SiO matrix -- ZnO matrix -- Magneto-optics -- Absorption
Аннотация: Magnetic and magneto-optical properties of cobalt nanoparticles (Co-NPs) dispersed in a transparent dielectric SiO2 and semiconductor ZnO matrices have been investigated. Field and temperature dependences of the samples magnetization showed the typical behavior of an ensemble of superparamagnetic particles with a blocking temperature near and below room temperature. The spectroscopy of magnetic circular dichroism (MCD) in the visible and near-infrared light ranges has revealed a significant difference between the behavior of the Co-NPs and a solid Co film. It has been found that the MCD spectrum shape for the Co-NPs does not depend on the matrix type. The room temperature magneto-optical activity of the Co-NPs in the different matrices has been estimated as an indicator for practical applications.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Department of Physics, National Sun Yat-sen University, 80424 Kaohsiung, Taiwan
Department of Applied Physics, National University of Kaohsiung, 81148 Kaohsiung, Taiwan
Siberian Federal University, Krasnoyarsk, Russia
Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg, Russia
Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center RAS, Kazan, Russia

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Chou, Hsiung; Petrov, D. A.; Петров, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Neznakhin, Dmitry; Stepanova, Elena; Stepanov, Andrey
}
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Particles–matrix bond in ZnCoO:H and ZnCoAlO:H films: Issues of magnetism and spin injection / Yu. E. Samoshkina, M. V. Rautskii, D. S. Neznakhin [et al.] // Materials. - 2023. - Vol. 16, Is. 10. - Ст. 3659, DOI 10.3390/ma16103659. - Cited References: 45. - This work was supported by the Russian Science Foundation [grant number 21-72-00061] . - ISSN 1996-1944
Кл.слова (ненормированные):
thin films -- zinc oxide -- metallic Co nanoparticles -- magnetic properties -- magnetic circular dichroism spectroscopy -- giant magnetoresistance effect
Аннотация: ZnCoO:H and ZnCoAlO:H films were synthesized by radio frequency magnetron sputtering in a (1 − x)Ar + xH2 mixed atmosphere with x = 0.2–0.5. The films contain different amounts of metallic Co particles (from 7.6% and higher) ~4–7 nm in size. The magnetic and magneto-optical (MO) behavior of the films was analyzed in combination with their structural data. The samples exhibit high values of magnetization (up to 377 emu/cm3) and MO response at room temperature. Two situations are considered: (1) the film magnetism is associated only with isolated metal particles and (2) magnetism is present both in the oxide matrix and in metal inclusions. It has been established that the formation mechanism of the magnetic structure of ZnO:Co2+ is due to the spin-polarized conduction electrons of metal particles and zinc vacancies. It was also found that in the presence of two magnetic components in the films, these components are exchange-coupled. In this case, the exchange coupling generates a high spin polarization of the films. The spin-dependent transport properties of the samples have been studied. A high value of the negative magnetoresistance of the films at room temperature (~4%) was found. This behavior was explained in terms of the giant magnetoresistance model. Thus, the ZnCoO:H and ZnCoAlO:H films with high spin polarization can be considered as sources of spin injection.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Natural Sciences and Mathematics, Ural Federal University, 620002 Yekaterinburg, Russia
Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, China
Department of Applied Physics, National University of Kaohsiung, Kaohsiung 81148, China

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Neznakhin, D. S.; Stepanova, E. A.; Edelman, I. S.; Эдельман, Ирина Самсоновна; Chou, Hsiung
}
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Samoshkina, Yu. E.
Low-hydrogenated ZnCoAlO films: structure, magneto-optical and magnetic behavior / Y. E. Samoshkina, D. A. Petrov, H. Chou // Appl. Phys. A. - 2022. - Vol. 128, Is. 6. - Ст. 519, DOI 10.1007/s00339-022-05665-z. - Cited References: 16. - This research was funded by the Russian Science Foundation Grant No. 21-72-00061 . - ISSN 0947-8396
Кл.слова (ненормированные):
Diluted oxides -- Polycrystalline thin films -- Hydrogenation -- Magnetic circular dichroism
Аннотация: Morphology, chemical composition, crystal structure, and magnetic circular dichroism of ZnO films doped simultaneously with Co and Al (CAZO) have been studied. The films were deposited on glass substrates by the RF magnetron sputtering of the Zn0.93Co0.05Al0.02O target. Low hydrogen concentrations of 1–4% were used in mixed Ar + H2 atmosphere together with high enough substrate temperature of 450 °C. A tendency to a decrease in the Zn amount and an increase in the relative Co and Al content in the films has been revealed in the presence of hydrogen in the atmosphere. The structural data of the studied films correlate well with those for high-hydrogenated (20–50% H2) CAZO films deposited under the same conditions and studied earlier. The new data indicate the prospect of obtaining ferromagnetic samples based on ZnO without any secondary phases.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan
Department of Applied Physics, National University of Kaohsiung, Kaohsiung, 81148, Taiwan

Доп.точки доступа:
Petrov, D. A.; Петров, Дмитрий Анатольевич; Chou, H.; Самошкина, Юлия Эрнестовна
}
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Strain-induced charge ordering in Pr-Sr manganites (X ≤ 0.4) / Yu. E. Samoshkina, M. V. Rauckii, D. S. Neznakhin [et al.] // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. H : Magnetism of strongly correlated electron systems. - Ст. H.P17. - P. 107. - Cited References: 7 . - ISBN 978-5-94469-051-7

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Ural Federal University, Yekaterinburg, Russia
National University of Science and Technology (NUST “MISIS”), Moscow, Russia
Krasnoyarsk Rail Transport Institute, Irkutsk State Transport University, Krasnoyarsk, Russia

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Rauckii, M.V.; Рауцкий, Михаил Владимирович; Neznakhin, D. S.; Stepanova, E. A.; Andreev, N. V.; Андреев, Н. В.; Chichkov, V. I.; Чичков, В.И.; Chernichenko, A. V.; Черниченко, Ангелина Виталиевна; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
}
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    Co nanoparticles localized in matrices of Various types: magnetooptical and magnetotransport properties / Yu. E. Samoshkina, D. A. Petrov, M. V. Rautskii [et al.] // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect. : Magnetotransport, magnetooptics and magnetophotonics. - Ст. D.P14. - P. 466-467. - Cited References: 8. - This research was funded by the Russian Science Foundation grant No. 21-72-00061 . - ISBN 978-5-94469-051-7
   Перевод заглавия: Наночастицы кобальта, локализованные в матрицах разного типа: магнитооптические и магнитотранспортные свойства

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Ural Federal University, Ekaterinburg, Russia
Zavoisky Physical-Technical Institute, Russian Academy of Sciences, Kazan, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \program com.\; Овчинников, Сергей Геннадьевич; Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Petrov, D. A.; Петров, Дмитрий Анатольевич; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Neznakhin, D. S.; Stepanova, E. A.; Stepanov, A. L.; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
}
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Structure and physical properties of hydrogenated (Co + Al)-doped ZnO films: Comparative study with co-doped ZnO films / Y. E. Samoshkina, I. S. Edelman, H. Chou [et al.] // Mater. Sci. Eng. B. - 2021. - Vol. 264. - Ст. 114943, DOI 10.1016/j.mseb.2020.114943. - Cited References: 52. - H.C. thanks the Ministry of Science and Technology of Taiwan for financial support [grant number MOST 108-2112-M-110-003]. The scanning electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by Ministry of Science and Higher Education of the Russian Federation [state assignment number FSRZ-2020-0011]. X-ray diffraction data were obtained using analytical equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 0921-5107
Кл.слова (ненормированные):
(Co + Al)-doped ZnO -- Co-doped ZnO -- Diluted oxides -- Thin films -- Hydrogenation -- Room temperature ferromagnetism
Аннотация: (Co + Al)-doped ZnO films have been synthesized by the RF magnetron sputtering. Films of this composition have first been obtained in mixed atmosphere of Ar + H2. High hydrogen concentration of 20–50% has been used together with high enough substrate temperature of 450 °C. The used technological conditions affected the morphology, chemical composition, optical, electric, and magnetic properties of the films to an even more than in the case of Co-doped ZnO films synthesized under the same conditions and studied earlier. The films exhibit ferromagnetic behavior at room temperature with much greater magnetization and magneto-optical activity compared to the Co-doped films. At the same time, the hydrogenated films show an increase in electric conductivity in comparison with samples synthesized in the atmosphere of Ar + O2. The magnetic nature of the hydrogenated films has been associated with the defect-related mechanism.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
Department of Applied Physics, National University of Kaohsiung, Kaohsiung, 81148, Taiwan
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Chou, H.; Lin, H. -C.; Dwivedi, G. D.; Petrov, D. A.; Петров, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Zeer, G. M.; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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    High-temperature martensitic transformation in Pr-Sr manganites / Yu. E. Samoshkina, M. V. Rautskii, D. S. Neznakhin [et al.] // IEEE International Magnetics Virtual Conference (INTERMAG'21) : Digest book. - 2021. - Ст. DP-08. - P. 686. - Cited References: 8
   Перевод заглавия: Высокотемпературная мартенситная трансформация в Pr-Sr манганитах

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Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Neznakhin, D. S.; Stepanova, E.; Andreev, N. V.; Андреев Н. В.; Chichkov, V. I.; Чичков В.И.; IEEE International Magnetics Conference(2021 ; Apr. 26-30 ; Lion, France (Virtual))
}
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    Magneto-optics of hydrogenated ZnO, ZnO:Co, and ZnO:(Co+Al) films / Yu. E. Samoshkina, M. V. Rautskii, D. S. Neznakhin [et al.] // 2nd International workshop on advanced magnetic oxides (IWAMO-2021) : workshop book. - 2021. - P. 30. - Cited References: 4. - This research was funded by the Russian Science Foundation grant No. 21-72-00061
   Перевод заглавия: Магнитооптика гидрированных пленок ZnO, ZnO:Co и ZnO:(Co+Al)

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Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Petrov, D. A.; Петров, Дмитрий Анатольевич; Chou, H.; International Workshop on Advanced Magnetic Oxides(2 ; 2021 ; Nov. 24-26 November ; Aveiro, Portugal (online)); University of Aveiro; Institute of Nanostructures, Nanomodelling and Nanofabrication
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10.

    Giant hydrogen effect on the structure and physical properties of ZnO and Co-doped ZnO films fabricated by the RF magnetron sputtering in Ar + H2 atmosphere / I. S. Edelman [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 489. - Ст. 165461, DOI 10.1016/j.jmmm.2019.165461. - Cited References: 39. - The work is supported by the Russian Academy of Sciences in the frames of Project No 0356-2017-0030 and by the Ministry of Science and Technology of Taiwan MOST 106-2112-M-110-001. . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Колоссальное влияние водорода на структуру и физические свойства пленок ZnO и ZnO допированных кобальтом, полученных методом высокочастотного магнетронного распыления в атмосфере аргона и водорода

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
MAGNETOOPTICAL PROPERTIES
OPTICAL-PROPERTIES
FERROMAGNETISM
Кл.слова (ненормированные):
ZnO films -- Co-doped ZnO films -- Films hydrogenation -- Magnetic circular -- dichroism -- Room temperature ferromagnetism
Аннотация: ZnO and Co-doped ZnO films were synthesized by the radio frequency magnetron sputtering in mixed atmosphere of Ar + 20% O2 and Ar + 20–50% H2. The morphology, chemical composition, crystal structure, optical transmission, electrical resistance, and magnetic circular dichroism of the films were investigated. It was established that the films thickness decreased several times when Ar was partly replaced by hydrogen in the sputtering chamber. At the same time, for the Co-doped ZnO films, the increase in the relative Co content with the increasing hydrogen concentration was observed. These phenomena are explained by the formation of gaseous ZnH2 because of the hydrogen reaction with the growing films under the conditions of the high substrate temperature (450 °C) and, respectively, the decrease in the Zn component in the films. The hydrogenated Co-doped ZnO films exhibit an increase in electric conductivity and ferromagnetic behavior at room temperature. The magnetic nature of the films is explained by a combination of the intrinsic ferromagnetism (due to the formation of the Co-H-Co complex) with the inclusion of metallic Co clusters.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 80424, Taiwan.
Natl Univ Kaohsiung, Dept Appl Phys, Kaohsiung 81148, Taiwan.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
ESRF, CS 40220, F-38043 Grenoble, France.

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Chou, Hsiung; Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Petrov, D. A.; Петров, Дмитрий Анатольевич; Lin, Hsien C.; Chan, Wen L.; Sun, Shih-Jye; Zharkov, S. M.; Жарков, Сергей Михайлович; Bondarenko, G. V.; Бондаренко, Геннадий Васильевич; Platunov, M. S.; Платунов, Михаил Сергеевич; Rogalev, A.; Russian Academy of Sciences [0356-2017-0030]; Ministry of Science and Technology of Taiwan [MOST 106-2112-M-110-001]
}
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