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    Micromagnetic analysis of edge effects in a thin magnetic film during local excitation of magnetization oscillations / B. A. Belyaev, A. V. Izotov, G. V. Skomorokhov, P. N. Solovev // Russ. Phys. J. - 2020. - Vol. 63, Is. 5. - P. 837-843, DOI 10.1007/s11182-020-02106-3. - 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 . - ISSN 1064-8887. - ISSN 1573-9228
Рубрики:
ANISOTROPIES
   SIMULATIONS
   FIELDS
Кл.слова (ненормированные):
micromagnetic simulation -- thin magnetic film -- edge effects -- ferromagnetic resonance -- magnetic anisotropy
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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Публикация на русском языке Микромагнитный анализ краевых эффектов в тонкой магнитной пленке при локальном возбуждении колебаний намагниченности [Текст] / Б. А. Беляев, А. В. Изотов, Г. В. Скоморохов, П. Н. Соловьев // Изв. вузов. Физика. - 2020. - Т. 63 № 5. - С. 116-121

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Izotov, A. V.; Изотов, Андрей Викторович; Skomorokhov, G. V.; Скоморохов, Георгий Витальевич; Solovev, P. N.; Соловьев, Платон Николаевич
}
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    Micromagnetic simulation of domain structure in thin permalloy films with in-plane and perpendicular anisotropy / P. N. Solovev, A. V. Izotov, B. A. Belyaev, N. M. Boev // Physica B. - 2020. - Vol. 604. - Ст. 412699, DOI 10.1016/j.physb.2020.412699. - Cited References: 31. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation , agreement number 075-11-2019-054 dated 22.11.2019 . - ISSN 0921-4526
   Перевод заглавия: Микромагнитное моделирование доменной структуры тонких пермаллоевых пленок с одноосной планарной и перпендикулярной анизотропией
Кл.слова (ненормированные):
Micromagnetic simulation -- Thin magnetic film -- Magnetic anisotropy -- Stripe domains -- Hysteresis loop -- Saturation field
Аннотация: We investigate the domain structure formation and magnetization processes in thin permalloy films with in-plane and perpendicular magnetic anisotropy by using micromagnetic simulation. We show that the films of thicknesses less than a critical value Lcr are in the monodomain state, and their magnetization processes are specified by the in-plane anisotropy. Above the critical thickness Lcr, the perpendicular anisotropy dominates, leading to the formation of the stripe domain structure that significantly complicates the magnetization reversal. The values of the critical thickness, parameters of the domain structure, and the saturation field obtained from the micromagnetic simulations are compared with the corresponding values calculated using analytical expressions derived by Murayama in the framework of the domain structures theory.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50/38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Solovev, P. N.; Соловьев, Платон Николаевич; Izotov, A. V.; Изотов, Андрей Викторович; Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович
}
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Magnetic properties of permalloy thin film edges / B. A. Belyaev, N. M. Boev, A. V. Izotov [et al.] // Russ. Phys. J. - 2020. - Vol. 63, Is. 1. - P. 16-22, DOI 10.1007/s11182-020-01997-6. - Cited References: 23. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation (Project No. 02.G25.31.0313). . - ISSN 1064-8887. - ISSN 1573-9228
Рубрики:
ANISOTROPIES
Кл.слова (ненормированные):
magnetic thin film -- ferromagnetic resonance -- edge effects -- magnetic anisotropy
Аннотация: The paper presents the results of ferromagnetic resonance (FMR) spectrometry of magnetic properties of nanocrystalline thin films obtained by magnetron sputtering of permalloy targets of various composition (NixFe1-x, x = 0.6-0.85). The behavior of the main magnetic properties of the thin film edges is analyzed. Near the film edges, not only the fluctuation of the uniaxial magnetic anisotropy field is observed, but also a drastic widening of the FMR line and the decrease in the effective saturation magnetization.

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Публикация на русском языке Особенности поведения магнитных характеристик вблизи краев тонких пермаллоевых пленок [Текст] / Б. А. Беляев, Н. М. Боев, А. В. Изотов [и др.] // Изв. вузов. Физика. - 2020. - Т. 63 № 1. - С. 17-23

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович; Izotov, A. V.; Изотов, Андрей Викторович; Skomorokhov, G. V.; Скоморохов, Георгий Витальевич; Solovev, P. N.; Соловьев, Платон Николаевич; Ministry of Science and Higher Education of the Russian Federation [02, G25.31.0313]
}
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Soft magnetic FeCo films produced by green chemistry technique / E. A. Denisova, L. A. Chekanova, I. V. Nemtsev [et al.] // J. Phys.: Conf. Ser. - 2020. - Vol. 1582, Is. 1. - Ст. 012077DOI 10.1088/1742-6596/1582/1/012077. - Cited References: 10. - This work was funded by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 18-42-240006 Nanomaterials with magnetic properties determined by the topological features of the nanostructure). The authors thank the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS for the provided equipment
Кл.слова (ненормированные):
Binary alloys -- Cobalt alloys -- Coercive force -- Deposition -- Industrial research -- Magnetic anisotropy -- Morphology -- Reducing agents -- Surface morphology
Аннотация: The saturation magnetizations, local magnetic anisotropy field and coercivity values of FeCo film plated under various processing conditions have been investigated to optimize soft magnetic properties. Herein, we introduce a very promising processing technique based on the electrodeless deposition of FeCo film with carbohydrates as reducing agents. The produced FeCo film demonstrated significantly better saturation magnetization values and less contaminations, compared to those for the sample preparing with conventional reducing agent (sodium hypophosphite). The surface morphology and coercivities of FeCo films are dependent on the iron content and type of reducing agent. The coercive force values range from 12 up to 30 Oe and the saturation magnetization from 150 to 240 emu/g depending on the bath composition and deposition parameters. Maximum of saturation magnetization magnitude is reached for FeCo film with 30% cobalt. The local anisotropy field value of FeCo alloys increases with a decrease in Fe content for all reducing agent types.

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Держатели документа:
Kirensky Institute of Physics, Sb Russian Academy of Sciences, 50/38, Akademgorodok str., Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 79 Svobodny ave., Krasnoyarsk, 660041, Russian Federation
Scientific Center, Federal Research Center Ksc Sb Ras, 50 Akademgorodok str., Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, 31 Krasnoyarsky Rabochy ave., Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Chekanova, L. A.; Чеканова, Лидия Александровна; Nemtsev, I. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Shepeta, N. A.; International Conference on High-Tech and Innovations in Research and Manufacturing(28 February 2020 ; Krasnoyarsk, Russian Federation)
}
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Collective Spin Glass State in Nanoscale Particles of Ferrihydrite / S. V. Stolyar, R. N. Yaroslavtsev, V. P. Ladygina [et al.] // Semiconductors. - 2020. - Vol. 54, Is. 12. - P. 1710-1712DOI 10.1134/S1063782620120362. - Cited References: 16. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 19-42-240012 r_a “Magnetic resonance in ferrihydrite nanoparticles: Effects associated with the “core–shell” structure). This work was supported by a grant from the President of the Russian Federation for state support of young Russian scientists – candidates of sciences no. MK-1263.2020.3
Кл.слова (ненормированные):
nanoparticles -- ferrihydrite -- magnetic anisotropy -- magnetic resonance
Аннотация: Ferromagnetic resonance was used to study three types of ferrihydrite nanoparticles: nanoparticles formed as a result of the cultivation of microorganisms Klebsiella oxytoca; chemically prepared ferrihydrite nanoparticles; chemically prepared ferrihydrite nanoparticles doped with Cu. It is established from the ferromagnetic resonance data that the frequency-field dependence (in the temperature range ТP ‹ T ‹ T*) is described by the expression: 2πν/γ ⁼ НR + HA(T = 0)(1 – T/Т*), where γ is the gyromagnetic ratio, HR is the resonance field. The induced anisotropy HA is due to the spin-glass state of the near-surface regions. TP temperature characterizes the energy of the interparticle interaction of nanoparticles.

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Держатели документа:
Kirensky Institute of Physics, SB Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Ladygina, V. P.; Balaev, D. A.; Балаев, Дмитрий Александрович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; International Symposium “Nanostructures: Physics and Technology”(28th ; Sept 28 - Oct 2, 2020 ; Minsk, Republic of Belarus)
}
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Magnetic hysteresis of blocked ferrihydrite nanoparticles / S. V. Komogortsev, D. A. Balaev, A. A. Krasikov [et al.] // AIP Adv. - 2021. - Vol. 11, Is. 1. - Ст. 015329, DOI 10.1063/9.0000111. - Cited References: 23. - The magnetic measurements were partially carried out on the equipment of the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences. This study was supported by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1263.2020.3) . - ISSN 2158-3226
Кл.слова (ненормированные):
Hysteresis -- Hysteresis loops -- Magnetic anisotropy -- Magnetic materials -- Nanoparticles -- Anisotropy field -- Ferrihydrites -- Field amplitudes -- Magnetic anisotropy field -- Minor hysteresis loop -- Stoner-Wohlfarth model -- Uniaxial anisotropy -- Nanomagnetics
Аннотация: Using minor hysteresis loops in the Stoner-Wohlfarth model allows describing the experimental behavior of the coercive force of minor hysteresis loops in ferrihydrite nanoparticles with a change in the field amplitude. The description allows estimating the parameters of the distribution of the magnetic anisotropy field in nanoparticles. The best agreement of the anisotropy fields estimated by different approaches is achieved for the assumption of uniaxial anisotropy in ferrihydrite nanoparticles.

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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk Science Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович; Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Stolyar, S. V.; Yaroslavtsev, R. N.; Ladygina, V. P.; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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Square plate shaped magnetite nanocrystals / S. V. Komogortsev, S. V. Stolyar, L. A. Chekanova [et al.] // J. Magn. Magn. Mater. - 2021. - Vol. 527. - Ст. 167730, DOI 10.1016/j.jmmm.2021.167730. - Cited References: 42. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects No. 20-42-240001 and 20-42-242902 and by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1263.2020.3). We are grateful to the Center of collective use of FRC KSC SB RAS for the provided equipment . - ISSN 0304-8853
Кл.слова (ненормированные):
Magnetite -- Nanoparticles -- Magnetic anisotropy
Аннотация: Square plate shaped magnetite nanocrystals have been synthesized by chemical precipitation from solution using arabinogalactan. A high crystal quality was observed in the plate plane while, across the plate, there is some stratification. The magnetic hysteresis in such particles is determined by the bulk magnetocrystalline anisotropy, plate shape anisotropy, and surface magnetic anisotropy. It is shown using the micromagnetic simulation that the ferromagnetic square nanoplates exhibit the extraordinary magnetization switching anisotropy, which should be taken into account for understanding the hysteretic properties of the particles.

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Держатели документа:
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович; Stolyar, S. V.; Столяр, Сергей Викторович; Chekanova, L. A.; Чеканова, Лидия Александровна; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Eroshenko, P. E.; Ерошенко, П. Е.; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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Multiscale magnetic anisotropy in amorphous ferromagnetic ribbon: An example of fecundsib alloy / N. Ilin, S. Komogortsev, V. Ivanov [et al.] // Solid State Phenom. - 2020. - Vol. 312 SSP. - P. 275-280DOI 10.4028/www.scientific.net/SSP.312.275. - Cited References: 19. - The reported study was funded by RFBR, project number 19-32-90182. This work was financially supported by the state task of the Ministry of Science and Higher Education of the Russian Federation №0657-2020-0005
Кл.слова (ненормированные):
Amorphous alloys -- Kerr microscopy -- Magnetic anisotropy -- Magnetic properties -- Soft magnet
Аннотация: An understanding of the magnetic properties in an amorphous alloy requires comprehensive studies of magnetic anisotropy at various scales. In this paper such a study is carried out using amorphous ribbons FeCuNbSiB. The magnetic anisotropy associated with the rolling axis of ribbons does not affect hysteresis loop measurements, but the disappearance of a fingerprint-like pattern in the domain structure occurs in different fields when they are applied along and transverse the rolling axis. A correlation between the local magnetic anisotropy constant and the nanoscale within which the local easy axis is ordered was found.

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Держатели документа:
Far Eastern Federal University, Vladivostok, 690090, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, 660049, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Science, Vladivostok, 690090, Russian Federation

Доп.точки доступа:
Ilin, Nikita; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Ivanov, Vitaliy; Kraynova, Galina; Davydenko, Alexander; Tkachenko, Ivan; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Plotnikov, Vladimir; Asian School-Conference on Physics and Technology of Nanostructured Materials(5 ; 2020 ; 30 Jul - 3 Aug ; Vladivostok); Азиатская школа-конференция по физике и технологии наноструктурированных материалов(5 ; 2013 ; 30 июля - 3 авг. ; Владивосток)
}
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Effect of mechanical stress on structure of magnetization of three-layer nanosized disks / V. A. Orlov, V. S. Prokopenko, R. Y. Rudenko, I. N. Orlova // Phys. Met. Metallogr. - 2020. - Vol. 121, Is. 11. - P. 1039-1044, DOI 10.1134/S0031918X20100075. - Cited References: 38. - The research was funded by the Russian Foundation for Basic Research (RFBR), i.e., theoretical and numerical calculations by project No. 18-02-00161 and experimental study by project no. 20-02-00696 . - ISSN 0031-918X
Кл.слова (ненормированные):
nanolancet -- nanodisk -- magnetoelastic effect -- magnetic anisotropy
Аннотация: The contribution of magnetoelastic effects to the effective magnetic anisotropy of a three-layer film nanodisk (nonmagnetic metal/ferromagnet/nonmagnetic metal) was studied. The mechanical stresses at the lateral surface of the disk that are caused by two factors, i.e., unequal thermal expansion of layers and excess surface energy at the layers interfaces, were estimated. The case in which the contribution of magnetoelastic effects to the anisotropy is comparable with those of shape and crystalline anisotropies was discussed. It was shown that the main reason for the change in the local anisotropy field in the vicinity of a nanodisk edge was the mechanical stresses induced by the excess surface energy. The possible application of film nanodisks of nickel with a bilateral golden coating as “nanolancets” for noninvasive cell surgery of tumors was discussed.

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Публикация на русском языке Влияние механических напряжений на структуру намагниченности трехслойных наноразмерных дисков [Текст] / В. А. Орлов, В. С. Прокопенко, Р. Ю. Руденко, И. Н. Орлова // Физ. металлов и металловед. - 2020. - Т. 121 № 11. - С. 1135-1141

Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Astafiev Krasnoyarsk State Pedagogical University, Krasnoyarsk, 660049, Russian Federation

Доп.точки доступа:
Orlov, V. A.; Орлов, Виталий Александрович; Prokopenko, V. S.; Rudenko, R. Y.; Orlova, I. N.
}
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10.

CoPt-Al2O3 nanocomposite films: synthesis, structure, and magnetic properties / V. S. Zhigalov, L. E. Bykova, V. G. Myagkov [et al.] // J. Surf. Ingestig. - 2020. - Vol. 14, Is. 1. - P. 47-53, DOI 10.1134/S102745102001022X. - Cited References: 29. - This study was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects no. 18-42-243009 r_mol_a and no. 19-43-240003 r_a, and the Foundation for Assistance to Small Innovative Enterprises in Science and Technology, contract no. 11843GU/2017, code 0033636, U.M.N.I.K. competition. . - ISSN 1027-4510. - ISSN 1819-7094

РУБ Physics, Condensed Matter
Рубрики:
SOLID-STATE SYNTHESIS
   GRANULAR THIN-FILMS
   THERMITE SYNTHESIS
   PHASE
Кл.слова (ненормированные):
thin films -- ferromagnetic nanocomposites -- CoPt alloy -- magnetic anisotropy
Аннотация: The structure and magnetic properties of CoPt–Al2O3 nanocomposite films synthesized by the annealing of Al/(Co3O4 + Pt) bilayers on a MgO(001) substrate at 650°C in vacuum are investigated. The synthesized composite films contain ferromagnetic CoPt grains with an average size of 25–45 nm enclosed in a nonconducting Al2O3 matrix. The saturation magnetization (Ms ~ 330 G) and coercivity (Hc ≈ 6 kOe) of the films are measured in the film plane and perpendicular to it. The obtained films are characterized by a spatial rotational magnetic anisotropy, which makes it possible to arbitrarily set the easy magnetization axis in the film plane or perpendicular to it using a magnetic field stronger than the coercivity (H ˃ Hc).

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Публикация на русском языке Нанокомпозитные пленки CoPt–Al2O3: синтез, структурные и магнитные свойства [Текст] / В. С. Жигалов, Л. Е. Быкова, В. Г. Мягков [и др.] // Поверхность. - 2020. - № 1. - С. 60-67

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian State Univ Sci & Technol, Krasnoyarsk 660014, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Zhigalov, V. S.; Жигалов, Виктор Степанович; Bykova, L. E.; Быкова, Людмила Евгеньевна; Myagkov, V. G.; Мягков, Виктор Григорьевич; Pavlova, A. N.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Matsynin, A. A.; Мацынин, Алексей Александрович; Patrin, G. S.; Патрин, Геннадий Семёнович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [18-42-243009 r_mol_a, 19-43-240003 r_a]; Foundation for Assistance to Small Innovative Enterprises in Science and Technology [11843GU/2017, 0033636]
}
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