Electric-field control of spin accumulation direction for spin-orbit torques

Rahul Mishra, Farzad Mahfouzi, Dushyant Kumar, Kaiming Cai, Mengji Chen, Xuepeng Qiu, Nicholas Kioussis and Hyunsoo Yang ()
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Rahul Mishra: National University of Singapore
Farzad Mahfouzi: California State University
Dushyant Kumar: National University of Singapore
Kaiming Cai: National University of Singapore
Mengji Chen: National University of Singapore
Xuepeng Qiu: Tongji University
Nicholas Kioussis: California State University
Hyunsoo Yang: National University of Singapore

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-018-08274-8

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