Current-Induced Spin-Orbit Torque and Field-Free Switching in Mo-Based Magnetic Heterostructures

被引：93

作者：

Chen, Tian-Yue ^{[1
]}

Chan, Hsin-I ^{[1
]}

Liao, Wei-Bang ^{[1
]}

Pai, Chi-Feng ^{[1
,2
]}

机构：

[1] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 10617, Taiwan

[2] Natl Taiwan Univ, Ctr Atom Initiat New Mat, Taipei 10617, Taiwan

来源：

PHYSICAL REVIEW APPLIED | 2018年 / 10卷 / 04期

关键词：

PERPENDICULAR MAGNETIZATION; DEPENDENCE; ANISOTROPY;

D O I：

10.1103/PhysRevApplied.10.044038

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnetic heterostructureMo/Co-Fe-B/MgO has strong perpendicular magnetic anisotropy and thermal stability. Through current-induced hysteresis loop shift measurements, we show that the damping-like spin-orbit torque (SOT) efficiency of Mo/Co-Fe-B/MgO heterostructures is xi(DL) approximate to -0.003 +/- 0.001 and is fairly independent of the annealing temperature from 300 degrees C to 400 degrees C. Although vertical bar xi(DL)vertical bar is small compared to those from Ta- or W-based heterostructures, reversible current-induced SOT switching of a thermally stable Mo/Co-Fe-B/MgO heterostruture can still be achieved. Furthermore, we observe field-free current-induced switching from a Mo/Co-Fe-B/MgO structure with the Mo layer being wedge-deposited. Our results indicate that even for a weak spin-orbit interaction 4d transition metal such as Mo, it is still possible to generate sufficient spin current for conventional SOT switching and to realize field-free current-induced switching by structural engineering.

引用

页数：8

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