title: Intrinsic spin torque without spin-orbit coupling.
abstract: We derive an intrinsic contribution to the non-adiabatic spin torque for non-uniform magnetic textures. It differs from previously considered contributions in several ways and can be the dominant contribution in some models. It does not depend on the change in occupation of the electron states due to the current flow but rather is due to the perturbation of the electronic states when an electric field is applied. Therefore it should be viewed as electric-field-induced rather than current-induced. Unlike previously reported non-adiabatic spin torques, it does not originate from extrinsic relaxation mechanisms nor spin-orbit coupling. This intrinsic non-adiabatic spin torque is related by a chiral connection to the intrinsic spin-orbit torque that has been calculated from the Berry phase for Rashba systems.
authors.affiliation: Basic Science Research Institute, Pohang University of Science and Technology, Pohang 790-784, Korea; PCTP and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea; Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA; Maryland NanoCenter, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Kyoung-Whan
authors.initials: KW
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea; KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 136-713, Korea.
authors.forename: Kyung-Jin
authors.initials: KJ
authors.lastname: Lee
authors.affiliation: PCTP and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Hyun-Woo
authors.initials: HW
authors.lastname: Lee
authors.affiliation: Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Stiles