期刊
APPLIED PHYSICS LETTERS
卷 104, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4866186
关键词
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资金
- NRF [2011-0028163, NRF-2013R1A2A2A01013188]
- Human Resources Development Program, MKE/KETEP [20104010100640]
We theoretically investigate the threshold current for thermally activated switching of a perpendicular magnet by spin-orbit spin torque. Based on the Fokker-Planck equation, we obtain an analytic expression of the switching current, in agreement with numerical result. We find that thermal energy barrier exhibits a quasi-linear dependence on the current, resulting in an almost linear dependence of switching current on the log-scaled current pulse-width even below 10 ns. This is in stark contrast to standard spin torque switching, where thermal energy barrier has a quadratic dependence on the current and the switching current rapidly increases at short pulses. Our results will serve as a guideline to design and interpret switching experiments based on spin-orbit spin torque. (C) 2014 AIP Publishing LLC.
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