Steady motion of skyrmions and domains walls under diffusive spin torques
Type
ArticleKAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Spintronics Theory Group
Date
2017-03-08Permanent link to this record
http://hdl.handle.net/10754/623108
Metadata
Show full item recordAbstract
We explore the role of the spin diffusion of conducting electrons in two-dimensional magnetic textures (domain walls and skyrmions) with spatial variation of the order of the spin precession length λex. The effect of diffusion reflects in four additional torques that are third order in spatial derivatives of magnetization and bilinear in λex and in the nonadiabatic parameter β′. In order to study the dynamics of the solitons when these diffusive torques are present, we derive the Thiele equation in the limit of steady motion and we compare the results with the nondiffusive limit. When considering a homogenous current these torques increase the longitudinal velocity of transverse domain walls of width Δ by a factor (λex/Δ)2(α/3), α being the magnetic damping constant. In the case of single skyrmions with core radius r0 these new contributions tend to increase the Magnus effect in an amount proportional to (λex/r0)2(1+2αβ′).Citation
Elías RG, Vidal-Silva N, Manchon A (2017) Steady motion of skyrmions and domains walls under diffusive spin torques. Physical Review B 95. Available: http://dx.doi.org/10.1103/PhysRevB.95.104406.Sponsors
R.G.E. thanks Conicyt Pai/Concurso Nacional de Apoyo al Retorno de Investigadores/as desde el Extranjero Folio 821320024. N.V.-S. thanks CONICYT-PCHA/Doctorado Nacional/2014-21140141. A.M. was supported by the King Abdullah University of Science and Technology (KAUST).Publisher
American Physical Society (APS)Journal
Physical Review BAdditional Links
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.104406ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevB.95.104406