Magnetic circular dichroism in the canted antiferromagnet α-Fe2O3: Bulk single crystal and nanocrystals
URI (для ссылок/цитирований):
https://www.sciencedirect.com/science/article/pii/S0304885319325788?via%3Dihubhttps://elib.sfu-kras.ru/handle/2311/142518
Автор:
Ivantsov, R.
Ivanova, O.
Zharkov, S.
Molokeev, M.
Krylov, A.
Gudim, I.
Edelman, I.
Коллективный автор:
Институт инженерной физики и радиоэлектроники
Политехнический институт
Кафедра экспериментальной физики и инновационных технологий
Кафедра материаловедения и технологии обработки материалов
Дата:
2020-03Журнал:
Journal of Magnetism and Magnetic MaterialsКвартиль журнала в Scopus:
Q2Квартиль журнала в Web of Science:
Q2Библиографическое описание:
Ivantsov, R. Magnetic circular dichroism in the canted antiferromagnet α-Fe2O3: Bulk single crystal and nanocrystals [Текст] / R. Ivantsov, O. Ivanova, S. Zharkov, M. Molokeev, A. Krylov, I. Gudim, I. Edelman // Journal of Magnetism and Magnetic Materials. — 2020. — Т. 498. — С. 1-8Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Аннотация:
Hematite, α-Fe2O3, is a canted antiferromagnet with the Neel temperature of 960 K. The Morin transition, which
occurs when the temperature is lowered to ~260 K, when the magnetic moments of the sublattices become
strictly antiparallel to each other and the resulting magnetic moment disappears, is a characteristic feature of
this compound. Detailed investigations are presented here of the magneto-optical effects in the α-Fe2O3 nanoparticles
in the transmitted light and in the α-Fe2O3 single crystal in the reflected light. Two types of magnetooptic
features were revealed in the magnetic circular dichroism (MCD) spectrum. Some of them described by the
Gauss line shape were associated with one-ion d-d transitions. Others were described by the S-shaped line with
the inflection points corresponding to the absorption maxima. Last features were assigned to the pair excitonmagnon
transitions. An exceptionally strong S-shaped line at 2.0–2.5 eV appeared to be a unique feature of α-
Fe2O3 distinguishing it from other iron oxide compounds. The origin of the high effectiveness of the pair excitonmagnon
interaction giving rise to this strong S-shaped feature in the MCD spectrum of α-Fe2O3 is discussed