Spin-orbit torque in a three-dimensional topological insulator–ferromagnet heterostructure: Crossover between bulk and surface transport

Handle URI:
http://hdl.handle.net/10754/627571
Title:
Spin-orbit torque in a three-dimensional topological insulator–ferromagnet heterostructure: Crossover between bulk and surface transport
Authors:
Ghosh, Sumit; Manchon, Aurelien ( 0000-0002-4768-293X )
Abstract:
Current-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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program
Citation:
Ghosh 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.
Publisher:
American Physical Society (APS)
Journal:
Physical Review B
Issue Date:
2-Apr-2018
DOI:
10.1103/PhysRevB.97.134402
Type:
Article
ISSN:
2469-9950; 2469-9969
Sponsors:
This work was supported by the King Abdullah University of Science and Technology (KAUST). The authors would like to acknowledge support from KAUST Supercomputing facility.
Additional Links:
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.134402
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorGhosh, Sumiten
dc.contributor.authorManchon, Aurelienen
dc.date.accessioned2018-04-19T10:45:32Z-
dc.date.available2018-04-19T10:45:32Z-
dc.date.issued2018-04-02en
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.en
dc.identifier.issn2469-9950en
dc.identifier.issn2469-9969en
dc.identifier.doi10.1103/PhysRevB.97.134402en
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.en
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.en
dc.publisherAmerican Physical Society (APS)en
dc.relation.urlhttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.134402en
dc.rightsArchived with thanks to Physical Review Ben
dc.titleSpin-orbit torque in a three-dimensional topological insulator–ferromagnet heterostructure: Crossover between bulk and surface transporten
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalPhysical Review Ben
dc.eprint.versionPublisher's Version/PDFen
kaust.authorGhosh, Sumiten
kaust.authorManchon, Aurelienen
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