期刊
PHYSICAL REVIEW B
卷 96, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.064410
关键词
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资金
- National Science Foundation [NSF-ECCS-1408172]
- Samsung SGMI program
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1408172] Funding Source: National Science Foundation
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-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-s), 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-M-s rare-earth/transition-metal alloys as promising candidates for SOT device applications.
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