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Abstract

Charge-to-spin conversion is the key for the fundamental understanding of spin-orbitronics and efficient magnetization manipulation. Over the past decade, current induced spin accumulation in various materials has been extensively investigated. We report the direct spatial imaging of current induced spin accumulation at the channel edges of topological insulators (Bi₂Se₃ and BiSbTeSe₂) by a scanning photovoltage microscope [1]. We also reveal a close link between the spin texture and a new kind of magneto-resistance, which can map the spin texture of topological surface states by simple transport measurements [2]. Current induced spin-orbit torques (SOTs) provide a new way to manipulate the magnetization. We show current induced SOTs from a topological insulator Bi₂Se₃ [3] and magnetization switching at room temperature [4].

[1] Y. Liu et al., Nat. Commun. 9, 2492 (2018)
[2] P. He et al., Nat. Phys. 14, 495 (2018)
[3] Y. Wang et al., Phys. Rev. Lett. 114, 257202 (2015)
[4] Y. Wang et al., Nat. Commun. 8, 1364 (2017)

Biography

Hyunsoo Yang is a Globalfoundries Chaired associate professor in theDepartment of Electrical and Computer Engineering, National University of Singapore (NUS). He had worked at C&S technology, LG Electronics in San Jose, and Intelligent Fiber Optic Systems, California. He received his Doctorate from Stanford University, California. He worked on photonic devices for fiber communication at Stanford University. From 2004-2007, he was at IBM-Stanford Spintronic Science and Applications Center with Dr. Stuart Parkin. He has won several awards including an Outstanding Dissertation Award for 2006 from the American Physical Society (GMAG). He is working on various magnetic materials and devices for spintronics applications since he joined National University of Singapore in 2007. 

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