Driving a magnetized domain wall in an antiferromagnet by magnons

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We theoretically study the interaction of magnons, quanta of spin waves, and a domain wall in a one-dimensional easy-axis antiferromagnet in the presence of an external magnetic field applied along the easy axis. To this end, we begin by obtaining the exact solution for spin waves in the background of a domain wall magnetized by an external field. The finite magnetization inside the domain wall is shown to give rise to reflection of magnons scattering off the domain wall, deviating from the well-known result of reflection-free magnons in the absence of a magnetic field. For practical applications of the predicted reflection of magnons, we show that the magnon reflection contributes to the thermally driven domain-wall motion. Our work leads us to envision that inducing a finite magnetization in antiferromagnetic solitons such as vortices and skyrmions can be used to engender phenomena that do not occur in the absence of magnetization.
Publisher
AMER INST PHYSICS
Issue Date
2020-06
Language
English
Article Type
Article
Citation

JOURNAL OF APPLIED PHYSICS, v.127, no.22

ISSN
0021-8979
DOI
10.1063/5.0006038
URI
http://hdl.handle.net/10203/275425
Appears in Collection
PH-Journal Papers(저널논문)
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