Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101735
Title: Spin-torque resonance due to diffusive dynamics at the surface of a topological insulator
Authors: Sokolewicz, R. J.
Ado, I. A.
Katsnelson, M. I.
Ostrovsky, P. M.
Titov, M.
Issue Date: 2019
Publisher: American Physical Society
Citation: Spin-torque resonance due to diffusive dynamics at the surface of a topological insulator / R. J. Sokolewicz, I. A. Ado, M. I. Katsnelson, et al. — DOI 10.1103/PhysRevB.99.214444 // Physical Review B. — 2019. — Vol. 99. — Iss. 21. — 214444.
Abstract: We investigate spin-orbit torques on magnetization in an insulating ferromagnetic layer that is brought into close proximity to a topological insulator (TI). In addition to the well-known fieldlike spin-orbit torque, we identify an anisotropic anti-damping-like spin-orbit torque that originates in a diffusive motion of conduction electrons. This diffusive torque is vanishing in the limit of zero momentum (i.e., for a spatially homogeneous electric field or current), but it may, nevertheless, have a strong impact on spin-torque resonance at finite frequency provided the external field is neither parallel nor perpendicular to the TI surface. The required electric-field configuration can be created by a grated top gate. ©2019 American Physical Society.
Keywords: ELECTRIC FIELDS
ELECTRIC INSULATORS
FIELD EFFECT TRANSISTORS
TOPOLOGICAL INSULATORS
TORQUE
CLOSE PROXIMITY
CONDUCTION ELECTRONS
DIFFUSIVE DYNAMICS
DIFFUSIVE MOTIONS
EXTERNAL FIELDS
FERROMAGNETIC LAYERS
FINITE FREQUENCIES
SPATIALLY HOMOGENEOUS
SPIN DYNAMICS
URI: http://hdl.handle.net/10995/101735
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85068618003
PURE ID: 10283980
56d38379-9e2e-4491-8d1b-aa06d00ff219
ISSN: 24699950
DOI: 10.1103/PhysRevB.99.214444
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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