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Article: Spin dynamics of a magnetic antivortex: Micromagnetic simulations

TitleSpin dynamics of a magnetic antivortex: Micromagnetic simulations
Authors
Issue Date2007
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2007, v. 76 n. 22, article no. 220407, p. 220407-1-220407-4 How to Cite?
AbstractWe report on a study of the dynamics of a magnetic antivortex in a submicrometer, asteroid-shaped, permalloy ferromagnet using micromagnetic simulations. As with vortex states in disk and square geometries, a gyrotropic mode was found in which a shifted antivortex core orbits about the center of the asteroid. Pulsed magnetic fields were used to generate azimuthal or radial spin wave modes, depending on the field orientation. The degeneracy of low-frequency azimuthal mode frequencies is lifted by gyrotropic motion of the antivortex core, and restored by inserting a hole in the center of the particle to suppress this motion. We briefly compare the dynamics of the vortex state of the asteroid to the antivortex. The size dependence of the antivortex modes is reported. © 2007 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/169525
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, H-
dc.contributor.authorCampbell, CE-
dc.date.accessioned2012-10-22T07:18:16Z-
dc.date.available2012-10-22T07:18:16Z-
dc.date.issued2007-
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2007, v. 76 n. 22, article no. 220407, p. 220407-1-220407-4-
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10722/169525-
dc.description.abstractWe report on a study of the dynamics of a magnetic antivortex in a submicrometer, asteroid-shaped, permalloy ferromagnet using micromagnetic simulations. As with vortex states in disk and square geometries, a gyrotropic mode was found in which a shifted antivortex core orbits about the center of the asteroid. Pulsed magnetic fields were used to generate azimuthal or radial spin wave modes, depending on the field orientation. The degeneracy of low-frequency azimuthal mode frequencies is lifted by gyrotropic motion of the antivortex core, and restored by inserting a hole in the center of the particle to suppress this motion. We briefly compare the dynamics of the vortex state of the asteroid to the antivortex. The size dependence of the antivortex modes is reported. © 2007 The American Physical Society.-
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.titleSpin dynamics of a magnetic antivortex: Micromagnetic simulationsen_US
dc.typeArticleen_US
dc.identifier.emailWang, H: wangh75@hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.76.220407-
dc.identifier.scopuseid_2-s2.0-37349032854-
dc.identifier.hkuros204028-
dc.identifier.volume76-
dc.identifier.issue22, article no. 220407-
dc.identifier.spage220407-1-
dc.identifier.epage220407-4-
dc.identifier.isiWOS:000251986400008-
dc.publisher.placeUnited States-

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