Magnetic circular dichroism in the canted antiferromagnet α-Fe2O3: Bulk single crystal and nanocrystals | Научно-инновационный портал СФУ

Magnetic circular dichroism in the canted antiferromagnet α-Fe2O3: Bulk single crystal and nanocrystals

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.

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Издание

Журнал: Journal of Magnetism and Magnetic Materials

Выпуск журнала: Vol. 498

Номера страниц: 166208

ISSN журнала: 03048853

Издатель: Elsevier B.V.

Авторы

  • Ivantsov R. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
  • Ivanova O. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, RussiaArticle)
  • Zharkov S. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, RussiaArticle)
  • Molokeev M. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, RussiaArticle)
  • Krylov A. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
  • Gudim I. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)
  • Edelman I. (RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia)

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