Room temperature weak collinear ferrimagnet with symmetry driven, large intrinsic magneto-optic signatures

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Title: Room temperature weak collinear ferrimagnet with symmetry driven, large intrinsic magneto-optic signatures
Authors: Johnson, F
Zázvorka, J
Beran, L
Boldrin, D
Cohen, LF
Zemen, J
Veis, M
Item Type: Journal Article
Abstract: Here we present a magnetic thin film with a weak ferrimagnetic (FIM) phase above the Néel temperature (TN=240K) and a noncollinear antiferromagnetic (AFM) phase below, exhibiting a small net magnetization due to strain-associated canting of the magnetic moments. A long-range ordered FIM phase has been predicted in related materials, but without symmetry analysis. We now perform this analysis and use it to calculate the magneto-optical Kerr effect (MOKE) spectra in the AFM and FIM phases. From the good agreement between the form of the measured and predicted MOKE spectra, we propose the AFM and FIM phases share the magnetic space group C2′/m′ and that the symmetry-driven magneto-optic and magneto-transport properties are maximized at room temperature in the FIM phase due to the nonzero intrinsic Berry phase contribution present in these materials. A room temperature FIM with large optical and transport signatures, as well as sensitivity to lattice strain and magnetic field, has useful prospects for high-speed spintronic applications.
Issue Date: 9-Jan-2023
Date of Acceptance: 7-Nov-2022
DOI: 10.1103/PhysRevB.107.014404
ISSN: 1098-0121
Publisher: American Physical Society
Journal / Book Title: Physical Review B: Condensed Matter and Materials Physics
Volume: 107
Issue: 1
Copyright Statement: ©2023 American Physical Society.
Notes: 21 pages 4 figures 1 table 4 supplementary figures 1 supplementary table Co-first author: F. Johnson and J. Z\'azvorka Corresponding authors: L. F. Cohen and M. Veis; Typos corrected and discussion of symmetry added; title changed to be concise; text on figures made larger
Publication Status: Published
Article Number: ARTN 014404
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences