Dynamics of a vortex domain wall in a magnetic nanostrip: application of the collective-coordinate approach

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dc.contributor.author Clarke, D.J.
dc.contributor.author Tretiakov, O.A.
dc.contributor.author Chern, G.-W.
dc.contributor.author Bazaliy, Ya.B.
dc.contributor.author Tchernyshyov, O.
dc.date.accessioned 2009-12-29T14:58:55Z
dc.date.available 2009-12-29T14:58:55Z
dc.date.issued 2008-10-01
dc.identifier.citation Physical Review B (Condensed Matter and Materials Physics) 1 Oct. 2008, vol.78, no.13, 134412 (18 pp.) en
dc.identifier.uri http://jhir.library.jhu.edu/handle/1774.2/33729
dc.description.abstract The motion of a vortex domain wall in a ferromagnetic strip of submicron width under the influence of an external magnetic field exhibits three distinct dynamical regimes. In a viscous regime at low fields the wall moves rigidly with a velocity proportional to the field. Above a critical field the viscous motion breaks down, giving way to oscillations accompanied by a slow drift of the wall. At still higher fields the drift velocity starts rising with the field again but with a much lower mobility dv/dH than in the viscous regime. To describe the dynamics of the wall, we use the method of collective coordinates that focuses on soft modes of the system. By retaining two soft modes, parametrized by the coordinates of the vortex core, we obtain a simple description of the wall dynamics at low and intermediate applied fields that applies to both the viscous and oscillatory regimes below and above the breakdown. The calculated dynamics agrees well with micromagnetic simulations at low and intermediate values of the driving field. In higher fields, additional modes become soft and the two-mode approximation is no longer sufficient. We explain some of the significant features of vortex-domain-wall motion in high fields through the inclusion of additional modes associated with the half antivortices on the strip edge. en
dc.description.provenance Submitted by Susan Vazakas (svazakas@jhu.edu) on 2009-12-28T23:27:19Z No. of bitstreams: 1 Oleg Dynamics 2008.pdf: 678671 bytes, checksum: 0ecec5321dad1b43efc269892197d94f (MD5) en
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dc.description.provenance Made available in DSpace on 2009-12-29T14:58:55Z (GMT). No. of bitstreams: 1 Oleg Dynamics 2008.pdf: 678671 bytes, checksum: 0ecec5321dad1b43efc269892197d94f (MD5) Previous issue date: 2008-10-01 en
dc.language.iso en_US en
dc.publisher American Physical Society en
dc.subject ferromagnetic materials en
dc.subject vortex domain wall en
dc.subject magnetic nanostrip en
dc.subject ferromagnetic strip en
dc.subject micromagnetic simulations en
dc.subject inclusion en
dc.title Dynamics of a vortex domain wall in a magnetic nanostrip: application of the collective-coordinate approach en
dc.type Article en

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