Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics

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We theoretically study the dynamics of ferrimagnetic domain walls in the presence of a Dzyaloshinskii-Moriya interaction. We find that an application of a dc magnetic field can induce terahertz spin-wave emission by driving ferrimagnetic domain walls, which is not possible for ferromagnetic or antiferromagnetic domain walls. The Dzyaloshinskii-Moriya interaction is shown to facilitate terahertz spin-wave emission in a wide range of the net angular momentum by increasing the Walker breakdown field. Moreover, we show that spin-orbit torque combined with the Dzyaloshinskii-Moriya interaction also drives fast ferrimagnetic domain wall motion by emitting terahertz spin waves in a wide range of the net angular momentum.
Publisher
AMER PHYSICAL SOC
Issue Date
2017-09
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.96, no.10, pp.100407

ISSN
2469-9950
DOI
10.1103/PhysRevB.96.100407
URI
http://hdl.handle.net/10203/226621
Appears in Collection
PH-Journal Papers(저널논문)
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