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In this work we study the spin accumulation due to an in-plane electric fieldin an asymmetric topological insulator (TI) thin film system with an out ofplane magnetic field and an in-plane magnetization. A TI thin film differs fromthe more typically studied thick TI system in that the former has both a topand a bottom surface where the states localized at both surfaces can couple toeach other due to the finite thickness. In typical spin torque experiments onTI thin film systems, the top and bottom surfaces of the film are asymmetric asthe former is in contact with a ferromagnetic layer while the latter isadjacent to a non magnetic substrate. This may lead to differing (i) potentialsand (ii) magnetization strengths experienced by the top and bottom surfacestates. We show, via Kubo formula calculations, that each of these two effectscan lead to in-plane spin accumulation perpendicular to the magnetizationdirection which are otherwise absent in a top-bottom symmetric TI thin filmsystem. This spin accumulation results from the breaking of the antisymmetry ofthe spin accumulation around the zero magnetic field equal energy contours.

Spin accumulation in asymmetric topological insulator thin films in out of plane magnetic fields