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

Fleischer, Karsten ORCID: 0000-0002-7638-4480, Thiyagarajah, Naganivetha ORCID: 0000-0003-2888-1412, Lau, Yong-Chang ORCID: 0000-0001-6057-4733, Betto, Davide, Borisov, Kiril ORCID: 0000-0003-4679-2720, Smith, Christopher C., Shvets, Igor V. ORCID: 0000-0001-7451-5435, Coey, J. M. D. ORCID: 0000-0003-0053-8452 and Rode, Karsten ORCID: 0000-0003-2685-6547 (2018) Magneto-optic Kerr effect in a spin-polarized zero-moment ferrimagnet. Physical Review B, 98 (13). ISSN 2469-9950

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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 Mn2Rux Ga 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.

Item Type:Article (Published)
Refereed:Yes
Subjects:UNSPECIFIED
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:American Physical Society
Official URL:http://dx.doi.org/10.1103/PhysRevB.98.134445
Copyright Information:© 2018 American Physical Society. Open Access
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:European Union’s Horizon 2020 research and innovation programme under grant agreement No 737038., Science Foundation Ireland (SFI), grant number 06/IN.1/I91., Science Foundation Ireland (SFI), through AMBER and through grant number 16/IA/4534, Irish Research Council.
ID Code:23621
Deposited On:09 Aug 2019 09:41 by Vidatum Academic . Last Modified 01 Mar 2023 13:37

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