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dc.contributor.authorGhosh, Sumit
dc.contributor.authorManchon, Aurelien
dc.date.accessioned2017-12-28T07:32:15Z
dc.date.available2017-12-28T07:32:15Z
dc.date.issued2017-11-29
dc.identifier.urihttp://hdl.handle.net/10754/626549
dc.description.abstractCurrent-driven spin-orbit torques are investigated in a heterostructure composed of a ferromagnet deposited on top of a three dimensional topological insulator using the linear response formalism. We develop a tight-binding model of the heterostructure adopting a minimal interfacial hybridization scheme that promotes induced magnetic exchange on the topological surface states, as well as induced Rashba-like spin-orbit coupling in the ferromagnet. Therefore, our model accounts for spin Hall effect from bulk states together with inverse spin galvanic and magnetoelectric effects at the interface on equal footing. By varying the transport energy across the band structure, we uncover a crossover from surface-dominated to bulk-dominated transport regimes. We show that the spin density profile and the nature of the spin-orbit torques differ substantially in both regimes. Our results, which compare favorably with experimental observations, demonstrate that the large damping torque reported recently is more likely attributed to interfacial magnetoelectric effect, while spin Hall torque remains small even in the bulk-dominated regime.
dc.publisherarXiv
dc.relation.urlhttp://arxiv.org/abs/1711.11016v1
dc.relation.urlhttp://arxiv.org/pdf/1711.11016v1
dc.rightsArchived with thanks to arXiv
dc.titleSpin-orbit torque in 3D topological insulator-ferromagnet heterostructure: crossover between bulk and surface transport
dc.typePreprint
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.eprint.versionPre-print
dc.identifier.arxividarXiv:1711.11016
kaust.personGhosh, Sumit
kaust.personManchon, Aurelien
refterms.dateFOA2018-06-14T09:29:25Z


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