Role of spin diffusion in current-induced domain wall motion for disordered ferromagnets

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dc.contributor.authorAkosa, Collins Ashuko
dc.contributor.authorKim, Won-Seokko
dc.contributor.authorBisig, Andreko
dc.contributor.authorKlaeui, Mathiasko
dc.contributor.authorLee, Kyung-Jinko
dc.contributor.authorManchon, Aurelienko
dc.date.accessioned2020-11-23T04:10:08Z-
dc.date.available2020-11-23T04:10:08Z-
dc.date.created2020-11-18-
dc.date.issued2015-03-
dc.identifier.citationPHYSICAL REVIEW B, v.91, no.9-
dc.identifier.issn2469-9950-
dc.identifier.urihttp://hdl.handle.net/10203/277464-
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 similar to del(2)[m x (u . del)m] + xi del(2)[(u . del)m], where m is the local magnetization direction, u is the direction of injected current, and xi 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.languageEnglish-
dc.publisherAMER PHYSICAL SOC-
dc.titleRole of spin diffusion in current-induced domain wall motion for disordered ferromagnets-
dc.typeArticle-
dc.identifier.wosid000351341100003-
dc.identifier.scopusid2-s2.0-84925868926-
dc.type.rimsART-
dc.citation.volume91-
dc.citation.issue9-
dc.citation.publicationnamePHYSICAL REVIEW B-
dc.identifier.doi10.1103/PhysRevB.91.094411-
dc.contributor.localauthorLee, Kyung-Jin-
dc.contributor.nonIdAuthorAkosa, Collins Ashu-
dc.contributor.nonIdAuthorKim, Won-Seok-
dc.contributor.nonIdAuthorBisig, Andre-
dc.contributor.nonIdAuthorKlaeui, Mathias-
dc.contributor.nonIdAuthorManchon, Aurelien-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordPlusRELAXATION-
dc.subject.keywordPlusEXCITATION-
dc.subject.keywordPlusDYNAMICS-
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