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Title: Thermally activated switching of perpendicular magnet by spin-orbit spin torque

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‚ÄČns. 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.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [2] ;  [2]
  1. Department of Materials Science and Engineering, Korea University, Seoul 136-701 (Korea, Republic of)
  2. (Korea, Republic of)
  3. Spin Convergence Research Center, Korea Institute of Science and Technology, Seoul 136-791 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22283102
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIFFUSION BARRIERS; FOKKER-PLANCK EQUATION; L-S COUPLING; MAGNETS; ORBITS; PULSES; SPIN; THRESHOLD CURRENT; TORQUE