Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films

Qiming Shao, Chi Tang, Guoqiang Yu (), Aryan Navabi, Hao Wu, Congli He, Junxue Li, Pramey Upadhyaya, Peng Zhang, Seyed Armin Razavi, Qing Lin He, Yawen Liu, Pei Yang, Se Kwon Kim, Cheng Zheng, Yizhou Liu, Lei Pan, Roger K. Lake, Xiufeng Han, Yaroslav Tserkovnyak, Jing Shi and Kang L. Wang ()
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Qiming Shao: University of California
Chi Tang: University of California
Guoqiang Yu: University of California
Aryan Navabi: University of California
Hao Wu: Chinese Academy of Sciences
Congli He: University of California
Junxue Li: University of California
Pramey Upadhyaya: University of California
Peng Zhang: University of California
Seyed Armin Razavi: University of California
Qing Lin He: University of California
Yawen Liu: University of California
Pei Yang: University of California
Se Kwon Kim: University of California
Cheng Zheng: University of California
Yizhou Liu: University of California
Lei Pan: University of California
Roger K. Lake: University of California
Xiufeng Han: Chinese Academy of Sciences
Yaroslav Tserkovnyak: University of California
Jing Shi: University of California
Kang L. Wang: University of California

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Magnetic insulators (MIs) attract tremendous interest for spintronic applications due to low Gilbert damping and the absence of Ohmic loss. Spin-orbit torques (SOTs) on MIs are more intriguing than magnetic metals since SOTs cannot be transferred to MIs through direct injection of electron spins. Understanding of SOTs on MIs remains elusive, especially how SOTs scale with the MI film thickness. Here, we observe the critical role of dimensionality on the SOT efficiency by studying the MI layer thickness-dependent SOT efficiency in tungsten/thulium iron garnet (W/TmIG) bilayers. We show that the TmIG thin film evolves from two-dimensional to three-dimensional magnetic phase transitions as the thickness increases. We report the significant enhancement of the measured SOT efficiency as the TmIG thickness increases, which is attributed to the increase of the magnetic moment density. We demonstrate the current-induced SOT switching in the W/TmIG bilayers with a TmIG thickness up to 15 nm.

Date: 2018
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DOI: 10.1038/s41467-018-06059-7

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