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

Temperature dependence of spin-orbit torques across the magnetic compensation point in a... 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 (TM), 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 (Ms), whereas the spin-torque efficiency is independent of the temperature-dependent Ms. Our findings provide insight into spin transport mechanisms in ferrimagnets and highlight low-Ms rare-earth/transition-metal alloys as promising candidates for SOT device applications. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

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

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

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 (TM), 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 (Ms), whereas the spin-torque efficiency is independent of the temperature-dependent Ms. Our findings provide insight into spin transport mechanisms in ferrimagnets and highlight low-Ms rare-earth/transition-metal alloys as promising candidates for SOT device applications.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.064410
Publisher site
See Article on Publisher Site

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 (TM), 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 (Ms), whereas the spin-torque efficiency is independent of the temperature-dependent Ms. Our findings provide insight into spin transport mechanisms in ferrimagnets and highlight low-Ms rare-earth/transition-metal alloys as promising candidates for SOT device applications.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Aug 7, 2017

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