Magnetization pumping and dynamics in a Dzyaloshinskii-Moriya magnet

Authors

Alexey Kovalev, University of Nebraska - LncolnFollow
Utkan Güngördü, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2015

Citation

EPL (Europhysics Letters) 109, 67008 (2015)

Comments

Copyright EPLA, 2015. Used by permission.

Abstract

We formulate a phenomenological description of thin ferromagnetic layers with inversion asymmetry where the single-domain magnetic dynamics experiences magnon current-induced torques and leads to magnon-motive forces. We first construct a phenomenological theory based on irreversible thermodynamics, taking into account the symmetries of the system. Furthermore, we confirm that these effects originate from Dzyaloshinskii-Moriya interactions from the analysis based on the stochastic Landau-Lifshitz-Gilbert equation. Our phenomenological results generalize to a general form of Dzyaloshinskii-Moriya interactions and to other systems, such as pyrochlore crystals and chiral magnets. Possible applications include spin current generation, magnetization reversal and magnonic cooling.