Topological Surface States‐Induced Perpendicular Magnetization Switching in Pt/Co/Bi 2 Se 3  Heterostructures | Zendy

Zhang Xu | Zendy; Cui Baoshan | Zendy; Mao Jian | Zendy; Yun Jijun | Zendy; Yan Ze | Zendy; Chang Meixia | Zendy; Zuo Yalu | Zendy; Xi Li | Zendy

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Topological Surface States‐Induced Perpendicular Magnetization Switching in Pt/Co/Bi 2 Se 3 Heterostructures

Author(s) -

Zhang Xu,

Cui Baoshan,

Mao Jian,

Yun Jijun,

Yan Ze,

Chang Meixia,

Zuo Yalu,

Xi Li

Publication year - 2020

Publication title -

physica status solidi (rrl) – rapid research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.786

H-Index - 68

eISSN - 1862-6270

pISSN - 1862-6254

DOI - 10.1002/pssr.202000033

Subject(s) - spintronics , topological insulator , ferromagnetism , condensed matter physics , heterojunction , surface states , materials science , magnetization , spin (aerodynamics) , perpendicular , topology (electrical circuits) , surface (topology) , physics , magnetic field , quantum mechanics , geometry , mathematics , combinatorics , thermodynamics

Recently, the topological insulators (TIs) with topological surface states (TSS) exhibiting large spin–orbit torques (SOTs) in topological insulators/ferromagnetic (TIs/FM) systems have been a hot spot research in spintronics. Herein, the effective spin Hall angles ( θ SH eff) in perpendicularly magnetized Pt/Co/Bi 2 Se 3 stacks with different thicknesses of the Bi 2 Se 3 layers are investigated by the harmonic Hall resistance measurements. The results show that theθ SH efffor the TIs/FM heterostructures is substantially larger than the previously reported heavy metal/ferromagnetic (HM/FM). Moreover,θ SH effkeeps constant with the value around 0.35 in Pt/Co/Bi 2 Se 3 stacks with the variation of the thickness of Bi 2 Se 3 from 3.0 to 15.0 nm, indicating that the SOTs are mainly derived from the contribution of the TSS of Bi 2 Se 3 rather than the interfacial Rashba effect and/or bulk spin Hall effect. The results confirm that TIs with unique spintronic texture can play a crucial role in spintronics applications.

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