Magneto-optic Kerr effect in a spin-polarized zero-moment ferrimagnet

Karsten Fleischer, Naganivetha Thiyagarajah, Yong Chang Lau, Davide Betto, Kiril Borisov, Christopher C. Smith, Igor V. Shvets, J. M.D. Coey, Karsten Rode

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The magneto-optical Kerr effect (MOKE) is often assumed to be proportional to the magnetization of a magnetically ordered metallic sample; in metallic ferrimagnets with chemically distinct sublattices, such as rare-earth transition-metal alloys, it depends on the difference between the sublattice contributions. Here we show that in a highly spin polarized, fully compensated ferrimagnet, where the sublattices are chemically similar, a signal is observed even when the net moment is negligible. We analyze the spectral ellipsometry and MOKE of Mn2RuxGa and show that this behavior is due to a highly spin-polarized conduction band dominated by one of the two manganese sublattices (4c) which creates helicity-dependent reflectivity dominated by a broad Drude tail. Our findings open prospects for studying spin dynamics in the infrared.

Original languageEnglish
Article number134445
JournalPhysical Review B
Volume98
Issue number13
DOIs
Publication statusPublished - 2018 Oct 26

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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