Magnetic Domain Walls as Hosts of Spin Superfluids and Generators of Skyrmions

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A domain wall in a magnet with easy-axis anisotropy is shown to harbor spin superfluid associated with its spontaneous breaking of the U(1) spin-rotational symmetry. The spin superfluid is shown to have several topological properties, which are absent in conventional superfluids. First, the associated phase slips create and destroy Skyrmions to obey the conservation of the total Skyrmion charge, which allows us to use a domain wall as a generator and detector of Skyrmions. Second, the domain wall engenders the emergent magnetic flux for magnons along its length, which are proportional to the spin supercurrent flowing through it, and thereby provides a way to manipulate magnons. Third, the spin supercurrent can be driven by the magnon current traveling across it owing to the spin transfer between the domain wall and magnons, leading to the magnonic manipulation of the spin superfluid. The theory for superfluid spin transport within the domain wall is confirmed by numerical simulations.
Publisher
AMER PHYSICAL SOC
Issue Date
2017-07
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.119, no.4, pp.047202

ISSN
0031-9007
DOI
10.1103/PhysRevLett.119.047202
URI
http://hdl.handle.net/10203/274561
Appears in Collection
PH-Journal Papers(저널논문)
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