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摘要
M-H loops of current-driven spin-orbit torque (SOT) devices with NM/FM/AFM structure have been simulated at different temperature from 50-400 K by Hybrid Monte-Carlo micromagnetics in nanodots and large-sized films. The model includes the polycrystalline microstructure. The effects of anisotropy defects size on M-H loops of dots are discussed, which coincide with experimental scaling tendency, where a lower K-min at the defect center strongly influences the switching coercivity. Both the defect size and the temperature increase reduces the perpendicular coercivity H-c of nanodots. If the equivalent current-induced switching field is set as 100 mT, the critical switchable diameter of nanodots is around 50 nm with defect damage region of K-min < 0.65K, whereas in nearly perfectly deposited films (K-min -> K or insensitive to dot areas change), the critical switchable diameter will increase to around 100 nm.
- 出版日期2018-5
- 单位清华大学
