DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Se Kwon | ko |
dc.date.accessioned | 2021-01-28T06:20:21Z | - |
dc.date.available | 2021-01-28T06:20:21Z | - |
dc.date.created | 2020-12-03 | - |
dc.date.issued | 2016-03-16 | - |
dc.identifier.citation | APS March Meeting 2016 | - |
dc.identifier.uri | http://hdl.handle.net/10203/280342 | - |
dc.description.abstract | Domain walls (DWs) in an easy-axis antiferromagnet can be driven by several stimuli: a charge current (in conducting antiferromagnets), a magnon current, and a temperature gradient. In this talk, we discuss the dynamics of a DW induced by two latter external perturbations, which are applicable in both metallic and insulating antiferromagnets. First of all, we study the Brownian dynamics of a DW subjected to a temperature gradient [1]. To this end, we derive the Langevin equation for the DW's center of mass with the aid of the fluctuation-dissipation theorem. A DW behaves as a classical massive particle immersed in a viscous medium. By considering a thermodynamic ensemble of DWs, we obtain the Fokker-Planck equation, from which we extract the average drift velocity of a DW. We briefly address other mechanisms of thermally driven DW motion. Secondly, we analyze the dynamics of a DW driven by circularly polarized magnons [2]. Magnons passing through a DW reverse their spin upon transmission, thereby transferring two quanta of angular momentum to the DW and causing it to precess. A precessing DW partially reflects magnons back to the source. The reflection of magnons creates a previously identified reactive force [3]. We point out a second mechanism of propulsion of the DW, which we term redshift: magnons passing through a precessing DW reduce their linear momentum and transfer the decrease to the DW. We solve the equations of motion for magnons in the background of a uniformly precessing DW with the aid of supersymmetric quantum mechanics and compute the net force and torque applied by magnons to the DW. The theory agrees well with micromagnetic simulations. | - |
dc.language | English | - |
dc.publisher | APS Meeting | - |
dc.title | How to move domain walls in an antiferromagnet | - |
dc.type | Conference | - |
dc.type.rims | CONF | - |
dc.citation.publicationname | APS March Meeting 2016 | - |
dc.identifier.conferencecountry | US | - |
dc.identifier.conferencelocation | Baltimore, Maryland | - |
dc.contributor.localauthor | Kim, Se Kwon | - |
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