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Complementary spin-Hall and inverse spin-galvanic effect torques in a ferromagnet/semiconductor bilayer

Skinner, TD; Olejník, K; Cunningham, LK; Kurebayashi, H; Campion, RP; Gallagher, BL; Jungwirth, T; (2015) Complementary spin-Hall and inverse spin-galvanic effect torques in a ferromagnet/semiconductor bilayer. Nature Communications , 6 , Article 6730. 10.1038/ncomms7730. Green open access

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Abstract

Recently discovered relativistic spin torques induced by a lateral current at a ferromagnet/paramagnet interface are a candidate spintronic technology for a new generation of electrically controlled magnetic memory devices. The focus of our work is to experimentally disentangle the perceived two model physical mechanisms of the relativistic spin torques, one driven by the spin-Hall effect and the other one by the inverse spin-galvanic effect. Here, we show a vector analysis of the torques in a prepared epitaxial transition-metal ferromagnet/semiconductor-paramagnet single-crystal structure by means of the all-electrical ferromagnetic resonance technique. By choice of our structure in which the semiconductor paramagnet has a Dresselhaus crystal inversion asymmetry, the system is favourable for separating the torques due to the inverse spin-galvanic effect and spin-Hall effect mechanisms into the field-like and antidamping-like components, respectively. Since they contribute to distinct symmetry torque components, the two microscopic mechanisms do not compete but complement each other in our system.

Type: Article
Title: Complementary spin-Hall and inverse spin-galvanic effect torques in a ferromagnet/semiconductor bilayer
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/ncomms7730
Publisher version: http://dx.doi.org/10.1038/ncomms7730
Language: English
Additional information: Copyright © 2015 Macmillan Publishers Limited. All rights reserved.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1465843
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