Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Current-Induced Magnetic Domain-Wall Motion by Spin Transfer Torque: Collective Coordinate Approach with Domain-Wall Width Variation

  • Jung, Soon-Wook (Department of Physics, Pohang University of Science and Technology) ;
  • Lee, Hyun-Woo (Department of Physics, Pohang University of Science and Technology)
  • Published : 2007.03.31
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Abstract

The spin transfer torque generated by a spin-polarized current can induce the shift of the magnetic domain-wall position. In this work, we study theoretically the current-induced domain-wall motion by using the collective coordinate approach [Gen Tatara and Hiroshi Kohno, Phys. Rev. Lett. 92, 86601 (2004)]. The approach is extended to include not only the domain-wall position and the polarization angle changes but also the domain-wall width variation. It is demonstrated that the width variation affects the critical current.

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