1. Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films.
- Author
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Qiming Shao, Chi Tang, Guoqiang Yu, Navabi, Aryan, Hao Wu, Congli He, Junxue Li, Upadhyaya, Pramey, Peng Zhang, Seyed Armin Razavi, Qing Lin He, Yawen Liu, Pei Yang, Se Kwon Kim, Cheng Zheng, Yizhou Liu, Lei Pan, Lake, Roger K., Xiufeng Han, and Yaroslav Tserkovnyak
- 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 twodimensional 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. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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