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dc.contributor.authorAkosa, Collins Ashu
dc.contributor.authorKim, Won-Seok
dc.contributor.authorBisig, André
dc.contributor.authorKläui, Mathias
dc.contributor.authorLee, Kyung-Jin
dc.contributor.authorManchon, Aurelien
dc.date.accessioned2015-04-14T13:08:34Z
dc.date.available2015-04-14T13:08:34Z
dc.date.issued2015-03-12
dc.identifier.citationRole of spin diffusion in current-induced domain wall motion for disordered ferromagnets 2015, 91 (9) Physical Review B
dc.identifier.issn1098-0121
dc.identifier.issn1550-235X
dc.identifier.doi10.1103/PhysRevB.91.094411
dc.identifier.urihttp://hdl.handle.net/10754/550091
dc.description.abstractCurrent-induced spin transfer torque and magnetization dynamics in the presence of spin diffusion in disordered magnetic textures is studied theoretically. We demonstrate using tight-binding calculations that weak, spin-conserving impurity scattering dramatically enhances the nonadiabaticity. To further explore this mechanism, a phenomenological drift-diffusion model for incoherent spin transport is investigated. We show that incoherent spin diffusion indeed produces an additional spatially dependent torque of the form ∼∇2[m×(u⋅∇)m]+ξ∇2[(u⋅∇)m], where m is the local magnetization direction, u is the direction of injected current, and ξ is a parameter characterizing the spin dynamics (precession, dephasing, and spin-flip). This torque, which scales as the inverse square of the domain wall width, only weakly enhances the longitudinal velocity of a transverse domain wall but significantly enhances the transverse velocity of vortex walls. The spatial-dependent spin transfer torque uncovered in this study is expected to have significant impact on the current-driven motion of abrupt two-dimensional textures such as vortices, skyrmions, and merons.
dc.publisherAmerican Physical Society (APS)
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevB.91.094411
dc.rightsArchived with thanks to Physical Review B. ©2015 American Physical Society
dc.titleRole of spin diffusion in current-induced domain wall motion for disordered ferromagnets
dc.typeArticle
dc.contributor.departmentMaterials Science and Engineering Program
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalPhysical Review B
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Materials Science and Engineering, Korea University, Seoul 136-713, Korea
dc.contributor.institutionInstitut für Physik, Johannes Gutenberg Universität Mainz, 55128 Mainz, Germany
dc.contributor.institutionIBM Research-Zurich, 8803 Rüschlikon, Switzerland
dc.contributor.institutionKU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 136-713, Korea
kaust.personManchon, Aurelien
kaust.personAkosa, Collins Ashu
refterms.dateFOA2018-06-14T04:52:33Z


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