Magnetization pumping and dynamics in a Dzyaloshinskii-Moriya magnet
Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska Lincoln, NE 68588, USA
Received: 22 January 2015
Accepted: 22 March 2015
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.
PACS: 75.78.-n – Magnetization dynamics / 75.60.Jk – Magnetization reversal mechanisms / 85.80.Lp – Magnetothermal devices
© EPLA, 2015