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Article: High-topological-number magnetic skyrmions and topologically protected dissipative structure

TitleHigh-topological-number magnetic skyrmions and topologically protected dissipative structure
Authors
Issue Date2016
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2016, v. 93, p. article no. 024415 How to Cite?
AbstractThe magnetic skyrmion with the topological number of unity (Q=1) is a well-known nanometric swirling spin structure in the nonlinear σ model with the Dzyaloshinskii-Moriya interaction. Here we show that magnetic skyrmion with the topological number of two (Q=2) can be created and stabilized by applying vertical spin-polarized current though it cannot exist as a static stable excitation. Magnetic skyrmion with Q=2 is a nonequilibrium dynamic object, subsisting on a balance between the energy injection from the current and the energy dissipation by the Gilbert damping. Once it is created, it becomes a topologically protected object against fluctuations of various variables including the injected current itself. Hence we may call it a topologically protected dissipative structure. We also elucidate the nucleation and destruction mechanisms of the magnetic skyrmion with Q=2 by studying the evolutions of the magnetization distribution, the topological charge density, as well as the energy density. Our results will be useful for the study of the nontrivial topology of magnetic skyrmions with higher topological numbers.
Persistent Identifierhttp://hdl.handle.net/10722/223233
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933

 

DC FieldValueLanguage
dc.contributor.authorZhang, X-
dc.contributor.authorZhou, Y-
dc.contributor.authorEzawa, M-
dc.date.accessioned2016-02-23T01:55:49Z-
dc.date.available2016-02-23T01:55:49Z-
dc.date.issued2016-
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2016, v. 93, p. article no. 024415-
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10722/223233-
dc.description.abstractThe magnetic skyrmion with the topological number of unity (Q=1) is a well-known nanometric swirling spin structure in the nonlinear σ model with the Dzyaloshinskii-Moriya interaction. Here we show that magnetic skyrmion with the topological number of two (Q=2) can be created and stabilized by applying vertical spin-polarized current though it cannot exist as a static stable excitation. Magnetic skyrmion with Q=2 is a nonequilibrium dynamic object, subsisting on a balance between the energy injection from the current and the energy dissipation by the Gilbert damping. Once it is created, it becomes a topologically protected object against fluctuations of various variables including the injected current itself. Hence we may call it a topologically protected dissipative structure. We also elucidate the nucleation and destruction mechanisms of the magnetic skyrmion with Q=2 by studying the evolutions of the magnetization distribution, the topological charge density, as well as the energy density. Our results will be useful for the study of the nontrivial topology of magnetic skyrmions with higher topological numbers.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/-
dc.relation.ispartofPhysical Review B (Condensed Matter and Materials Physics)-
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleHigh-topological-number magnetic skyrmions and topologically protected dissipative structure-
dc.typeArticle-
dc.identifier.emailZhang, X: xichaozhang@hku.hk-
dc.identifier.emailZhou, Y: yanzhou@hku.hk-
dc.identifier.authorityZhou, Y=rp01541-
dc.description.naturepostprint-
dc.identifier.doi10.1103/PhysRevB.93.024415-
dc.identifier.hkuros256883-
dc.identifier.volume93-
dc.identifier.spagearticle no. 024415-
dc.identifier.epagearticle no. 024415-
dc.publisher.placeUnited States-

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