2017

Spin orbit torque in two-dimensional antiferromagnetic topological insulators

Spin orbit torque in two-dimensional antiferromagnetic topological insulators
S. Ghosh and A. Manchon
Phys. Rev. B 95, 035422 (2017)​​
S. Ghosh, A. Manchon
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2017
​We investigate spin transport in two-dimensional ferromagnetic (FTI) and antiferromagnetic (AFTI) topological insulators. In the presence of an in-plane magnetization AFTI supports zero energy modes, which enables topologically protected edge conduction at low energy. We address the nature of current-driven spin torque in these structures and study the impact of spin-independent disorder. Interestingly, upon strong disorder the spin torque develops an antidamping component (i.e., even upon magnetization reversal) along the edges, which could enable current-driven manipulation of the antiferromagnetic order parameter. This antidamping torque decreases when increasing the system size and when the system enters the trivial insulator regime.​