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Krasikov, A. A.
Analysis of magnetization processes in antiferromagnetic nanoparticles in strong pulse fields (Brief review) / A. A. Krasikov, D. A. Balaev // J. Exp. Theor. Phys. - 2023. - Vol. 136, Is. 1. - P. 97-105, DOI 10.1134/S1063776123010132. - Cited References: 43. - The authors are grateful to V.L. Kirillov for synthesis of a set of NiO samples, O.N. Mart’yanov for cooperation and discussion of results for NiO nanoparticles, V.P. Ladygina for synthesis of nanoferrihydrite, S.V. Stolyar and R.S. Iskhakov for cooperation and discussion of results for ferrihydrite, and A.D. Balaev, K.A. Shaikhutdinov, and S.I. Popkov for the decisive contribution to the realization of pulse field setup . - ISSN 1063-7761. - ISSN 1090-6509
Аннотация: We present a brief review of investigations and analysis of magnetization curves M(H) for NiO and ferrihydrite antiferromagnetic nanoparticles in external fields up to 250 kOe. For correct interpretation of magnetic properties of systems of antiferromagnetic nanoparticles, it is important to take into account the segment of M(H) dependences, which corresponds to high fields (exceeding 100 kOe). We analyze the regularities in the formation of additional magnetic subsystems in antiferromagnetically ordered nanoparticles due to the influence of size effects. These additional subsystems (the ferromagnetic subsystem associated with uncompensated magnetic moment and the subsystem of surface free spins) are estimated quantitatively. It is shown that antiferromagnetic nanoparticles with a size of 5 nm acquire the properties of “nanomagnets,” which are not inferior to those for iron-oxide ferromagnetic nanoparticles of the same size.

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Публикация на русском языке Красиков, Александр Александрович. Исследование процессов намагничивания антиферромагнитных наночастиц в сильных импульсных полях (миниобзор) [Текст] / А. А. Красиков, Д. А. Балаев // Журн. эксперим. и теор. физ. - 2023. - Т. 163 Вып. 1. - С. 115-124

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Красиков, Александр Александрович; Eurasian Symposium “Trends in Magnetism”(8 ; 22-26 August 2022 ; Kazan, Russia)
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Bacterial ferrihydrite nanoparticles: preparation, magnetic properties, and application in medicine / S. V. Stolyar [и др.] // Moscow Int. Symp. on Magnet. (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 3RP-O-10. - P. 417. - Cited References: 8. - Support by the Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation is acknowledged

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Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Balaev, D. A.; Балаев, Дмитрий Александрович; Ladygina, V. P.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Popkov, S. I.; Попков, Сергей Иванович; Bayukov, O. A.; Баюков, Олег Артемьевич; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Dobretsov, K. G.; Falaleev, O.V.; Chizhova, I. A.; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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Bacterial ferrihydrite nanoparticles: preparation, magnetic properties, and application in medicine / S. V. Stolyar [et al.] // J. Supercond. Novel Magn. - 2018. - Vol. 31, Is. 8. - P. 2297-2304, DOI 10.1007/s10948-018-4700-1. - Cited References: 37. - The 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 (Krasnoyarsk, Russia). . - ISSN 1557-1939
Кл.слова (ненормированные):
Nanoparticles -- Ferrihydrite -- Magnetic properties -- Drug delivery
Аннотация: Nanoparticles of antiferromagnetically ordered materials acquire the uncompensated magnetic moment caused by defects and surface effects. A bright example of such a nano-antiferromagnet is nanoferrihydrite consisting of particles 2–5 nm in size, the magnetic moment of which amounts to hundreds of Bohr magnetons per particle. We present a brief review of the studies on magnetic properties of ferrihydrite produced by bacteria. Special attention is focused on the aspects of possible biomedical applications of this material, i.e., the particle elimination, toxicity, and possible use for targeted drug delivery.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
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 Clinical Center, Krasnoyarsk, Russian Federation
Scientific Research Institute of Medical Problems of the North, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Balaev, D. A.; Балаев, Дмитрий Александрович; Ladygina, V. P.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Popkov, S. I.; Попков, Сергей Иванович; Bayukov, O. A.; Баюков, Олег Артемьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Dobretsov, K. G.; Morozov, E. V.; Морозов, Евгений Владимирович; Falaleev, O. V.; Фалалеев, Олег Владимирович; Inzhevatkin, E. V.; Kolenchukova, O. A.; Chizhova, I. A.
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Biogenic ferrihydrite nanoparticles: Synthesis, properties in vitro and in vivo testing and the concentration effect / S. V. Stolyar, O. A. Kolenchukova, A. V. Boldyreva [et al.] // Biomedicines. - 2021. - Vol. 9, Is. 3. - Ст. 323, DOI 10.3390/biomedicines9030323. - Cited References: 52. - This research was funded by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Regional Science Foundation, grant number 20-416-242907 . - ISSN 2227-9059

РУБ Biochemistry & Molecular Biology + Medicine, Research & Experimental + Pharmacology & Pharmacy

Кл.слова (ненормированные):
ferrihydrite nanoparticles -- concentration effect -- microorganisms Klebsiella oxytoca -- neutrophilic granulocytes -- chemiluminescence -- toxicology
Аннотация: Biogenic ferrihydrite nanoparticles were synthesized as a result of the cultivation of Klebsiella oxytoca microorganisms. The distribution of nanoparticles in the body of laboratory animals and the physical properties of the nanoparticles were studied. The synthesized ferrihydrite nanoparticles are superparamagnetic at room temperature, and the characteristic blocking temperature is 23-25 K. The uncompensated moment of ferrihydrite particles was determined to be approximately 200 Bohr magnetons. In vitro testing of different concentrations of ferrihydrite nanoparticles for the functional activity of neutrophilic granulocytes by the chemiluminescence method showed an increase in the release of primary oxygen radicals by blood phagocytes when exposed to a minimum concentration and a decrease in secondary radicals when exposed to a maximum concentration. In vivo testing of ferrihydrite nanoparticles on Wister rats showed that a suspension of ferrihydrite nanoparticles has chronic toxicity, since it causes morphological changes in organs, mainly in the spleen, which are characterized by the accumulation of hemosiderin nanoparticles (stained blue according to Perls). Ferrihydrite can also directly or indirectly stimulate the proliferation and intracellular regeneration of hepatocytes. The partial detection of Perls-positive cells in the liver and kidneys can be explained by the rapid elimination from organs and the high dispersion of the nanomaterial. Thus, it is necessary to carry out studies of these processes at the systemic level, since the introduction of nanoparticles into the body is characterized by adaptive-proliferative processes, accompanied by the development of cell dystrophy and tension of the phagocytic system.

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Держатели документа:
RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.
RAS, Krasnoyarsk Sci Ctr, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Biophys, Krasnoyarsk 660041, Russia.
RAS, Sci Res Inst Med Problems North, Fed Res Ctr KSC SB, Krasnoyarsk 660022, Russia.
RAS, Inst Biophys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Kolenchukova, Oksana A.; Boldyreva, Anna V.; Kudryasheva, Nadezda S.; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Krasikov, A. A.; Красиков, Александр Александрович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Ladygina, Valentina P.; Birukova, Elena A.; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Territory; Regional Science Foundation [20-416-242907]
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Capacitance dilatometer for small deformations measurements caused by external magnetic and electric fields and temperature / A. L. Freydman [et al.] // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 5PO-I2-2. - P. 1047

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Доп.точки доступа:
Freydman, A. L.; Фрейдман, Александр Леонидович; Popkov, S. I.; Попков, Сергей Иванович; Krasikov, A. A.; Красиков, Александр Александрович; Mikhashenok, N. V.; Михашенок, Наталья Владимировна; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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Change in the magnetic properties of nanoferrihydrite with an increase in the volume of nanoparticles during low-temperature annealing / D. A. Balaev [et al.] // Phys. Solid State. - 2016. - Vol. 58, Is. 9. - P. 1782-1791, DOI 10.1134/S1063783416090092. - Cited References: 32. - This study was supported by the Ministry of Education and Science of the Russian Federation within the State Task for 2014-2016. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
FERRIHYDRITE NANOPARTICLES
   BACTERIAL FERRIHYDRITE
   FERRITIN
   HYSTERESIS
   MOSSBAUER
   ORIGIN
Аннотация: The results of the investigation into the effect of low-temperature annealing of a powder of nanoparticles of bacterial ferrihydrite on its magnetic properties have been presented. It has been found that an increase in the time (up to 240 h) and temperature (in the range from 150 to 200°C) of annealing leads to a monotonic increase in the superparamagnetic blocking temperature, the coercive force, and the threshold field of the opening of the magnetic hysteresis loop (at liquid-helium temperatures), as well as to an increase in the magnetic resonance line width at low temperatures and in the magnetic susceptibility at room temperature. At the same time, according to the results of the analysis of the Mossbauer spectra, the annealing of ferrihydrite does not lead to the formation of new iron oxide phases. Most of these features are well consistent with the fact that the low-temperature annealing of ferrihydrite causes an increase in the size of nanoparticles, which is confirmed by the results of transmission electron microscopy studies. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Изменение магнитных свойств наноферригидрита в ходе низкотемпературного отжига, обусловленное ростом объeма наночастиц [Текст] / Д. А. Балаев [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 9. - С. 1724–1732

Держатели документа:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny pr. 79, Krasnoyarsk, Russian Federation
International Scientific Centre for Organism Extreme States Research, Presidium of the Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation
International Laboratory of High Magnetic Fields and Low Temperatures, ul. Gajowicka 95, Wroclaw, Poland

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ladygina, V. P.; Yaroslavtsev, R. N.; Bayukov, O. A.; Баюков, Олег Артемьевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович
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Control of peak effect in YBCO by Nd substitution / D. M. Gokhfel'd [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. O2.7. - P. 140. - References: 4. - The work was supported by Russian Foundation for Basic Research Grant No.16-38-00400 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
peak effect -- paramagnetic magnetization -- bulk superconductors -- critical current -- irreversibility field

Доп.точки доступа:
Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Semenov, S. V.; Семёнов, Сергей Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Terent'yev, K. Yu.; Терентьев, Константин Юрьевич; Freydman, A. L.; Фрейдман, Александр Леонидович; Krasikov, A. A.; Красиков, Александр Александрович; Petrov, M. I.; Петров, Михаил Иванович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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Dynamic magnetization of ε-Fe2O3 in pulse field: Evidence of surface effect / D. A. Balaev [et al.] // J. Appl. Phys. - 2015. - Vol. 117, Is. 6. - Ст. 063908, DOI 10.1063/1.4907586. - Cited References:30. - The work was supported by RFBR Grant Nos. 14-02-96002 and 12-02-00897, and project MIG S26/617 from the Ministry of Education and Science of Perm Region. . - ISSN 0021. - ISSN 1089-7550. -

РУБ Physics, Applied
Рубрики:
FERROMAGNETIC-RESONANCE
   COERCIVE FIELD
   NANOPARTICLES
   ANISOTROPY
Аннотация: The magnetization dynamics of ε-Fe2O3 nanoparticles with an average size of about 9 nm is investigated. From comparison of the hysteresis loops obtained in quasi-static conditions and under pulse fields with amplitudes up to 200 kOe and pulse lengths 8–32 ms, it follows that the effective coercivity increases considerably with the variation rate of the imposed magnetic field. A theoretical explanation of this behavior is proposed. The model takes into account the superparamagnetic effects as well as the fact that magnetic anisotropy of the nanoparticles, along with the bulk term, includes a surface contribution. The latter, being of minor importance for the observed magnetic behavior of 25–100 nm particles, becomes essential when the particle size is below 10 nm. From the experimental data, a reference value of the surface anisotropy of nanodisperse ε-Fe2O3 is established, and evidence is presented to the effect that below 300 K this contribution does not significantly depend on temperature.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Inst Continuous Media Mech, Ural Branch, Perm 614013, Russia
Perm Natl Res Polytech Univ, Perm 614990, Russia
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia
Ural Fed Univ, Ekaterinburg 620083, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Poperechny, I. S.; Krasikov, A. A.; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Balaev, A. D.; Балаев, Александр Дмитриевич; Yakushkin, S. S.; Bukhtiyarova, G. A.; Martyanov, O. N.; Raikher, Yu. L.
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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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10.

Dynamic remagnetisation of CoFe2O4 nanoparticles: thermal fluctuational thawing of anisotropy / D. A. Balaev, I. S. Poperechny, A. A. Krasikov [et al.] // J. Phys. D. - 2021. - Vol. 54, Is. 27. - Ст. 275003, DOI 10.1088/1361-6463/abf371. - Cited References: 63. - Experimental measurements were supported by Project No. AAAA-A17-117103050081-1. I S P and Yu L R acknowledge the support of ICMM in the framework of topical task AAAAA20-120020690030-5. The numerical calculations were performed on the Uran supercomputer (Ural Branch, Russian Academy of Sciences, Ekaterinburg) . - ISSN 0022-3727. - ISSN 1361-6463

РУБ Physics, Applied
Рубрики:
COBALT-FERRITE NANOPARTICLES
   MAGNETIC-PROPERTIES
   SIZE
   COERCIVITY
Кл.слова (ненормированные):
nanoparticles -- cobalt ferrite -- magnetodynamics -- superparamagnetism -- effective anisotropy
Аннотация: We report a study of the magnetodynamics of cobalt ferrite (CoFe2O4) nanoparticles with an average diameter of ~6 nm. Hysteresis loops were measured under quasi-static conditions and in pulse fields with amplitudes H0 of up to 130 kOe and for durations τP of 8 and 16 ms. The growth of coercivity Hc observed with an increase in the magnetic field variation rate dH/dt (determined by the values of H0 and τP) and the reduction of Hc with temperature is ascribed to the superparamagnetic effect. The proposed theoretical model explains the observed dependences fairly well. Notably, the effective magnetic anisotropy constant obtained exceeds the value for bulk crystals and might be indicative of the contribution of surface magnetic anisotropy.

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Держатели документа:
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660000, Russia.
Russian Acad Sci, Inst Continuous Media Mech, Ural Branch, Perm 614068, Russia.
Perm State Natl Res Univ, Dept Phase Transit Phys, Perm 614990, Russia.
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Poperechny, I. S.; Krasikov, A. A.; Красиков, Александр Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Kirillov, V. L.; Yakushkin, S. S.; Martyanov, O. N.; Raikher, Y. L.; [AAAA-A17-117103050081-1]; [AAAAA20-120020690030-5]
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