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- Title
Temperature‐Dependent Spin–Orbit Torques in Perpendicular Magnetic [Co/Ni]<sub>N</sub>/TbCo Composite Films.
- Authors
Xue, Hongwei; Chen, Shaohai; Wu, Di; Zhu, Weihua; Zhang, Yuanyuan; Duan, Chungang; Chen, Jingsheng; Jin, Qingyuan; Zhang, Zongzhi
- Abstract
The temperature (T) dependence of spin–orbit torque (SOT) efficiencies and magnetic properties are investigated in antiferromagnetically coupled Ta/Cu/[Co/Ni]N/TbCo perpendicular composite films. By changing the Co/Ni repetition number N, the magnetization compensation temperature TM can be widely modulated, decreasing from 295 K for N = 0 to below 10 K for N = 2. From temperature‐dependent harmonic Hall measurements, it is shown that damping–like SOT field per current density χDL = HDL/Jac varies in a similar way to the net saturation magnetization MS and reaches a maximum at T = TM, whereas field‐like HFL/Jac is nearly independent with T. The observed slight deviation between χDL and 1/MS versus T curves at reduced temperatures is attributed to the increased spin Hall angle and interfacial spin transparency. It is found that the SOT efficiency ξ varies from −0.04 to −0.06 and even to −0.13 for N = 0, 1 and 2, respectively, suggesting ξ is intensively dependent on the details of the Ta/ferromagnet (FM) interface and the FM layer material. These results provide more insight into the SOT effects for exchange‐coupled perpendicular composite structures, which are valuable for developing high‐performance SOT devices.
- Subjects
MAGNETIC properties; THIN films; MAGNETIZATION; FERROMAGNETIC materials; COMPOSITE structures
- Publication
Advanced Electronic Materials, 2019, Vol 5, Issue 6, pN.PAG
- ISSN
2199-160X
- Publication type
Article
- DOI
10.1002/aelm.201900014