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Title: Electric-field control of spin accumulation direction for spin-orbit torques
Authors: Mishra, R 
Mahfouzi, F
Kumar, D 
Cai, K 
Chen, M
Qiu, X
Kioussis, N
Yang, H 
Keywords: ferromagnetic material
heavy metal
electric field
Issue Date: 2019
Publisher: Nature Publishing Group
Citation: Mishra, R, Mahfouzi, F, Kumar, D, Cai, K, Chen, M, Qiu, X, Kioussis, N, Yang, H (2019). Electric-field control of spin accumulation direction for spin-orbit torques. Nature Communications 10 (1) : 248. ScholarBank@NUS Repository.
Abstract: Electric field is an energy-efficient tool that can be leveraged to control spin–orbit torques (SOTs). Although the amount of current-induced spin accumulation in a heavy metal (HM)/ferromagnet (FM) heterostructure can be regulated to a certain degree using an electric field in various materials, the control of its direction has remained elusive so far. Here, we report that both the direction and amount of current-induced spin accumulation at the HM/FM interface can be dynamically controlled using an electric field in an oxide capped SOT device. The applied electric field transports oxygen ions and modulates the HM/FM interfacial chemistry resulting in an interplay between the spin Hall and the interfacial torques which in turn facilitates a non-volatile and reversible control over the direction and magnitude of SOTs. Our electric-field controlled spin-orbitronics device can be programmed to behave either like the SOT systems with a positive spin Hall angle or a negative spin Hall angle. © 2019, The Author(s).
Source Title: Nature Communications
ISSN: 20411723
DOI: 10.1038/s41467-018-08274-8
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