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Title: In-plane current-driven spin-orbit torque switching in perpendicularly magnetized films with enhanced thermal tolerance

Abstract

Here, we study spin-orbit-torque (SOT)-driven magnetization switching in perpendicularly magnetized Ta/Mo/Co 40Fe 40B 20 (CoFeB)/MgO films. The thermal tolerance of the perpendicular magnetic anisotropy (PMA) is enhanced, and the films sustain the PMA at annealing temperatures of up to 430 C, due to the ultra-thin Mo layer inserted between the Ta and CoFeB layers. More importantly, the Mo insertion layer also allows for the transmission of the spin current generated in the Ta layer due to spin Hall effect, which generates a damping-like SOT and is able to switch the perpendicular magnetization. When the Ta layer is replaced by a Pt layer, i.e., in a Pt/Mo/CoFeB/MgO multilayer, the direction of the SOT-induced damping-like effective field becomes opposite because of the opposite sign of spin Hall angle in Pt, which indicates that the SOT-driven switching is dominated by the spin current generated in the Ta or Pt layer rather than the Mo layer. Quantitative characterization through harmonic measurements reveals that the large SOT effective field is preserved for high annealing temperatures. This work provides a route to applying SOT in devices requiring high temperature processing steps during the back-end-of-line processes.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [2];  [4]; ORCiD logo [3];  [5];  [2]
  1. Univ. of California, Los Angeles, CA (United States); Fudan Univ., Shanghai (China)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Fudan Univ., Shanghai (China)
  5. Univ. of California, Los Angeles, CA (United States); Inston, Inc., Los Angeles, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1470344
Grant/Contract Number:  
SC0012670
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 21; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 42 ENGINEERING; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Wu, Di, Yu, Guoqiang, Shao, Qiming, Li, Xiang, Wu, Hao, Wong, Kin L., Zhang, Zongzhi, Han, Xiufeng, Khalili Amiri, Pedram, and Wang, Kang L. In-plane current-driven spin-orbit torque switching in perpendicularly magnetized films with enhanced thermal tolerance. United States: N. p., 2016. Web. doi:10.1063/1.4952771.
Wu, Di, Yu, Guoqiang, Shao, Qiming, Li, Xiang, Wu, Hao, Wong, Kin L., Zhang, Zongzhi, Han, Xiufeng, Khalili Amiri, Pedram, & Wang, Kang L. In-plane current-driven spin-orbit torque switching in perpendicularly magnetized films with enhanced thermal tolerance. United States. doi:10.1063/1.4952771.
Wu, Di, Yu, Guoqiang, Shao, Qiming, Li, Xiang, Wu, Hao, Wong, Kin L., Zhang, Zongzhi, Han, Xiufeng, Khalili Amiri, Pedram, and Wang, Kang L. Fri . "In-plane current-driven spin-orbit torque switching in perpendicularly magnetized films with enhanced thermal tolerance". United States. doi:10.1063/1.4952771. https://www.osti.gov/servlets/purl/1470344.
@article{osti_1470344,
title = {In-plane current-driven spin-orbit torque switching in perpendicularly magnetized films with enhanced thermal tolerance},
author = {Wu, Di and Yu, Guoqiang and Shao, Qiming and Li, Xiang and Wu, Hao and Wong, Kin L. and Zhang, Zongzhi and Han, Xiufeng and Khalili Amiri, Pedram and Wang, Kang L.},
abstractNote = {Here, we study spin-orbit-torque (SOT)-driven magnetization switching in perpendicularly magnetized Ta/Mo/Co40Fe40B20 (CoFeB)/MgO films. The thermal tolerance of the perpendicular magnetic anisotropy (PMA) is enhanced, and the films sustain the PMA at annealing temperatures of up to 430 C, due to the ultra-thin Mo layer inserted between the Ta and CoFeB layers. More importantly, the Mo insertion layer also allows for the transmission of the spin current generated in the Ta layer due to spin Hall effect, which generates a damping-like SOT and is able to switch the perpendicular magnetization. When the Ta layer is replaced by a Pt layer, i.e., in a Pt/Mo/CoFeB/MgO multilayer, the direction of the SOT-induced damping-like effective field becomes opposite because of the opposite sign of spin Hall angle in Pt, which indicates that the SOT-driven switching is dominated by the spin current generated in the Ta or Pt layer rather than the Mo layer. Quantitative characterization through harmonic measurements reveals that the large SOT effective field is preserved for high annealing temperatures. This work provides a route to applying SOT in devices requiring high temperature processing steps during the back-end-of-line processes.},
doi = {10.1063/1.4952771},
journal = {Applied Physics Letters},
number = 21,
volume = 108,
place = {United States},
year = {2016},
month = {5}
}

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