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dc.contributor.authorGhosh, Sumit
dc.contributor.authorManchon, Aurelien
dc.date.accessioned2018-04-19T10:45:32Z
dc.date.available2018-04-19T10:45:32Z
dc.date.issued2018-04-02
dc.identifier.citationGhosh S, Manchon A (2018) Spin-orbit torque in a three-dimensional topological insulator–ferromagnet heterostructure: Crossover between bulk and surface transport. Physical Review B 97. Available: http://dx.doi.org/10.1103/PhysRevB.97.134402.
dc.identifier.issn2469-9950
dc.identifier.issn2469-9969
dc.identifier.doi10.1103/PhysRevB.97.134402
dc.identifier.urihttp://hdl.handle.net/10754/627571
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 the 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 dampinglike torque reported recently is more likely attributed to the Berry curvature of interfacial states, while spin Hall torque remains small even in the bulk-dominated regime.
dc.description.sponsorshipThis work was supported by the King Abdullah University of Science and Technology (KAUST). The authors would like to acknowledge support from KAUST Supercomputing facility.
dc.publisherAmerican Physical Society (APS)
dc.relation.urlhttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.134402
dc.rightsArchived with thanks to Physical Review B
dc.titleSpin-orbit torque in a three-dimensional topological insulator–ferromagnet heterostructure: Crossover between bulk and surface transport
dc.typeArticle
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentSpintronics Theory Group
dc.identifier.journalPhysical Review B
dc.eprint.versionPublisher's Version/PDF
kaust.personGhosh, Sumit
kaust.personManchon, Aurelien
refterms.dateFOA2018-06-14T05:54:35Z


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