Nondissipative electric driving on magnetization dynamics

Cong Xiao, Bangguo Xiong, Qian Niu

Published 2021-01-18Version 1

Established forms of electromagnetic coupling are usually conservative (in insulators) or dissipative (in metals and semiconductors). Here we point out the possibility of nondissipative driving on magnetization dynamics with steady energy pumping by an electric field, if the valence electronic states have nontrivial topology in the combined space of crystal momentum and magnetization configuration. We provide an explicit model system to demonstrate sustained magnetization motion in the presence of Gilbert damping but without joule heating from the electric field. We also generalize our results to magnetic textures, and discuss electric field induced Dzyaloshinskii-Moriya interaction which can be nonconservative as well as nondissipative.