Voltage control of spin–orbit torque in Pd/Co/Pd/HfOx. (4th December 2020)

• Record Type: Journal Article
• Authors: Hirai, Takamasa; Hibino, Yuki; Hasegawa, Kento; Kohda, Makoto; Koyama, Tomohiro; Chiba, Daichi
• Is Part Of: Applied physics express. Volume 13:Number 12(2020)
• Publication Date: 2020-12-04
• Subjects: spin–orbit torque -- voltage control -- magneto-ionic; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/abcd71
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: Voltage control of current-induced spin–orbit torque (SOT) in an in-plane-magnetized Pd/Co/Pd system with a low-temperature-deposited HfO x and a gate electrode on top is studied. An application of the gate electric field to the HfO x layer is to induce a non-volatile electrochemical effect from the Pd/HfO x interface. By means of low-frequency harmonic Hall measurements, the voltage modulation of both damping-like and field-like SOT is obtained. The sign of the voltage-induced SOT modification is found to be reversed by changing the top Pd thickness. Our finding is expected to facilitate the efficient active manipulation of SOT.