2017

Intrinsic non-adiabatic topological torque in magnetic skyrmions and vortices

Intrinsic non-adiabatic topological torque in magnetic skyrmions and vortices
C.A. Akosa, P.B. Ndiaye, and A. Manchon
Phys. Rev. B 95, 054434 (2017)​
C.A. Akosa, P.B. Ndiaye, A. Manchon
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2017
​We propose that topological spin currents flowing in topologically nontrivial magnetic textures, such as magnetic skyrmions and vortices, produce an intrinsic nonadiabatic torque of the form Tt∼[(∂xm×∂ym)⋅m]∂ym. We show that this torque, which is absent in one-dimensional domain walls and/or nontopological textures, is responsible for the enhanced nonadiabaticity parameter observed in magnetic vortices compared to one-dimensional textures. The impact of this torque on the motion of magnetic skyrmions is expected to be crucial, especially to determine their robustness against defects and pinning centers.​