Temperature dependence of spin-orbit torques across the magnetic compensation point in a ferrimagnetic TbCo alloy film
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PhysRevB.96.064410.pdf
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Author(s)
Ueda, Kohei
Mann, Maxwell
de Brouwer, Paul Wilhelmus
Bono, David C
Beach, Geoffrey Stephen
Date Issued
August 2017
Journal
Physical Review B
Publisher
American Physical Society
Citation
Ueda, Kohei et al. "Temperature dependence of spin-orbit torques across the magnetic compensation point in a ferrimagnetic TbCo alloy film." Physical Review B 96, 6 (August 2017): 064410. © 2017 American Physical Society
Version
Final published version
Abstract
The temperature dependence of spin-orbit torques (SOTs) and spin-dependent transport parameters is measured in bilayer Ta/TbCo ferrimagnetic alloy films with bulk perpendicular magnetic anisotropy. We find that the dampinglike (DL)-SOT effective field diverges as temperature is swept through the magnetic compensation temperature (T[subscript M]), where the net magnetization vanishes due to the opposing contributions from the Tb and Co sublattices. We show that DL-SOT scales with the inverse of the saturation magnetization (M[subscript s]), whereas the spin-torque efficiency is independent of the temperature-dependent M [subscript s]. Our findings provide insight into spin transport mechanisms in ferrimagnets and highlight low-M [subscript s] rare-earth/transition-metal alloys as promising candidates for SOT device applications.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.96.064410
