Тип публикации: статья из журнала
Год издания: 2020
Идентификатор DOI: 10.1016/j.jmmm.2019.166208
Ключевые слова: Ellipsometric parameters, Hematite, Magnetic circular dichroism, One-ion d-d transitions, Optical absorption, Pare exciton-magnon transitions, Raman scattering, α-Fe2O3
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 magneto-optic 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 exciton-magnon 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 exciton-magnon interaction giving rise to this strong S-shaped feature in the MCD spectrum of α-Fe2O3 is discussed. © 2019 Elsevier B.V.
Журнал: Journal of Magnetism and Magnetic Materials
Выпуск журнала: Vol. 498
Номера страниц: 166208
ISSN журнала: 03048853
Издатель: Elsevier B.V.
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