Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Current-Driven Domain-Wall Depinning in Pt/CoFe/Pt Nanowires with Perpendicular Magnetic Anisotropy

  • Kim, Kab-Jin (Department of Physics, Seoul National University) ;
  • Lee, Jae-Chul (Department of Physics, Seoul National University) ;
  • Choe, Sug-Bong (Department of Physics, Seoul National University)
  • Published : 2009.09.30
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Abstract

The spin transfer torque efficiency was determined experimentally by observing the current-driven domainwall depinning of Pt/CoFe/Pt nanowires with perpendicular magnetic anisotropy. The depinning time was exponentially proportional to the applied magnetic field, and was well explained by the Neel-Brown formula. The depinning time and threshold magnetic field were varied considerably by injecting current into the nanowire. The spin transfer torque efficiency was estimated to be $(7.2{\pm}0.9){\times}10^{-15}Tm^2$/A from the linear dependence of the threshold current density with respect to the applied magnetic field.

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