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Temperature dependence of spin-orbit torques across the magnetic compensation point in a ferrimagnetic TbCo alloy film

Author(s)
Ueda, Kohei; Mann, Maxwell; de Brouwer, Paul Wilhelmus; Bono, David C; Beach, Geoffrey Stephen
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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.
Date issued
2017-08
URI
http://hdl.handle.net/1721.1/110946
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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
ISSN
2469-9950
2469-9969

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