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Article: Spin dynamics of a magnetic antivortex: Micromagnetic simulations
Title | Spin dynamics of a magnetic antivortex: Micromagnetic simulations |
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Authors | |
Issue Date | 2007 |
Publisher | American 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. 1-4 How to Cite? |
Abstract | We 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 Identifier | http://hdl.handle.net/10722/169525 |
ISSN | 2014 Impact Factor: 3.736 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Wang, H | - |
dc.contributor.author | Campbell, CE | - |
dc.date.accessioned | 2012-10-22T07:18:16Z | - |
dc.date.available | 2012-10-22T07:18:16Z | - |
dc.date.issued | 2007 | - |
dc.identifier.citation | Physical Review B (Condensed Matter and Materials Physics), 2007, v. 76 n. 22, article no. 220407 , p. 1-4 | - |
dc.identifier.issn | 1098-0121 | - |
dc.identifier.uri | http://hdl.handle.net/10722/169525 | - |
dc.description.abstract | We 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.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://prb.aps.org/ | - |
dc.relation.ispartof | Physical Review B (Condensed Matter and Materials Physics) | - |
dc.rights | Copyright 2007 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevB.76.220407 | - |
dc.title | Spin dynamics of a magnetic antivortex: Micromagnetic simulations | en_US |
dc.type | Article | en_US |
dc.identifier.email | Wang, H: wangh75@hku.hk | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevB.76.220407 | - |
dc.identifier.scopus | eid_2-s2.0-37349032854 | - |
dc.identifier.hkuros | 204028 | - |
dc.identifier.volume | 76 | - |
dc.identifier.issue | 22 | - |
dc.identifier.spage | article no. 220407, p. 1 | - |
dc.identifier.epage | article no. 220407, p. 4 | - |
dc.identifier.isi | WOS:000251986400008 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 1098-0121 | - |