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Mössbauer Spectroscopy Study of the Superparamagnetism of Ultrasmall ϵ-Fe2O3 Nanoparticles Научная публикация

Журнал Journal of Experimental and Theoretical Physics Letters (JETP Letters)
ISSN: 0021-3640 , E-ISSN: 1090-6487
Вых. Данные Год: 2018, Том: 108, Номер: 8, Страницы: 527-531 Страниц : 5 DOI: 10.1134/s0021364018200092
Ключевые слова HIGH-TEMPERATURE; PARTICLES; EPSILON-FE2O3; PHASE; MODEL
Авторы Knyazev Yu.V. 1 , Balaev D.A. 1 , Kirillov V.L. 2 , Bayukov O.A. 1 , Mart’yanov O.N. 2
Организации
1 Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036 Russia
2 Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia

Информация о финансировании (1)

1 Российский научный фонд 17-12-01111

Реферат: The superparamagnetism of an ensemble of ϵ-Fe2O3 nanoparticles with a mean size of 3.9 nm dispersed in a xerogel SiO2 matrix is studied by the Mössbauer spectroscopy method. It is shown that most nanoparticles at room temperature are in the superparamagnetic (unblocked) state. As the temperature decreases, the progressive blocking of the magnetic moments of the particles occurs, which is manifested in the Mössbauer spectra as the transformation of the quadrupole doublet into a Zeeman sextet. The analysis of the relative intensity of the superparamagnetic (quadrupole doublet) and magnetically split (sextets) spectral components in the range of 4–300 K provides the particle size distribution, which is in agreement with the transmission electron microscopy data. The values of the effective magnetic anisotropy constants (Keff) are determined, and the contribution of surface anisotropy (KS) is estimated for particles of various sizes. It is shown that the quantity Keff is inversely proportional to the particle size, which indicates the significant contribution of the surface to the magnetic state of the ϵ-Fe2O3 nanoparticles with the size of several nanometers.
Библиографическая ссылка: Knyazev Y.V. , Balaev D.A. , Kirillov V.L. , Bayukov O.A. , Mart’yanov O.N.
Mössbauer Spectroscopy Study of the Superparamagnetism of Ultrasmall ϵ-Fe2O3 Nanoparticles
Journal of Experimental and Theoretical Physics Letters (JETP Letters). 2018. V.108. N8. P.527-531. DOI: 10.1134/s0021364018200092 WOS Scopus РИНЦ CAPlus OpenAlex
Оригинальная: Князев Ю.В. , Балаев Д.А. , Кириллов В.Л. , Баюков О.А. , Мартьянов О.Н.
Изучение суперпарамагнетизма ультрамалых наночастиц ǫ-FE2O3 методом мессбауэровской спектроскопии
Письма в Журнал экспериментальной и теоретической физики. 2018. Т.108. №7-8. С.558-562. DOI: 10.1134/S0370274X18200067 РИНЦ
Даты:
Поступила в редакцию: 23 июл. 2018 г.
Принята к публикации: 7 сент. 2018 г.
Опубликована в печати: 1 окт. 2018 г.
Опубликована online: 29 дек. 2018 г.
Идентификаторы БД:
Web of science: WOS:000454566200006
Scopus: 2-s2.0-85059225828
РИНЦ: 38635041
Chemical Abstracts: 2019:5246
OpenAlex: W2907503734
Цитирование в БД:
БД Цитирований
Scopus 21
Web of science 24
РИНЦ 27
OpenAlex 24
Альметрики: