Effect of inter-layer spin diffusion on skyrmion motion in magnetic multilayers
Autor: | Serban Lepadatu |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
0301 basic medicine
Materials science F300 FOS: Physical sciences lcsh:Medicine Article 03 medical and health sciences Magnetization Surfaces interfaces and thin films 0302 clinical medicine Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Surface roughness Torque Diffusion (business) lcsh:Science Spin-½ Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Skyrmion lcsh:R Spin-transfer torque Spintronics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 030104 developmental biology Ferromagnetism Spin diffusion Condensed Matter::Strongly Correlated Electrons lcsh:Q 030217 neurology & neurosurgery |
Zdroj: | Scientific Reports, Vol 9, Iss 1, Pp 1-12 (2019) Scientific Reports |
ISSN: | 2045-2322 |
Popis: | It is well known that skyrmions can be driven using spin-orbit torques due to the spin-Hall effect. Here we show an additional contribution in multilayered stacks arises from vertical spin currents due to inter-layer diffusion of a spin accumulation generated at a skyrmion. This additional interfacial spin torque is similar in form to the in-plane spin transfer torque, but is significantly enhanced in ultra-thin films and acts in the opposite direction to the electron flow. The combination of this diffusive spin torque and the spin-orbit torque results in skyrmion motion which helps to explain the observation of small skyrmion Hall angles even with moderate magnetisation damping values. Further, the effect of material imperfections on threshold currents and skyrmion Hall angle is also investigated. Topographical surface roughness, as small as a single monolayer variation, is shown to be an important contributing factor in ultra-thin films, resulting in good agreement with experimental observations. |
Databáze: | OpenAIRE |
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