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Threshold Current of Domain Wall Motion under Extrinsic Pinning, $β$-Term and Non-Adiabaticity

Gen Tatara·Toshihiko Takayama·Hiroshi Kohno·Junya Shibata·Yoshinobu Nakatani·Hidetoshi Fukuyama
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Abstract

Threshold current of domain wall motion under spin-polarized electric current in ferromagnets is theoretically studied based on the equation of motion of a wall in terms of collective coordinates. Effects of non-adiabaticity and a so-called $β$-term in Landau-Lifshitz equation, which are described by the same term in the equation of motion of a wall, are taken into account as well as extrinsic pinning. It is demonstrated that there are four different regimes characterized by different dependence of threshold on extrinsic pinning, hard-axis magnetic anisotropy, non-adiabaticity and $β$.

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Gen Tatara, Toshihiko Takayama, Hiroshi Kohno, Junya Shibata, Yoshinobu Nakatani, Hidetoshi Fukuyama. 2006-04-12. Threshold Current of Domain Wall Motion under Extrinsic Pinning, $β$-Term and Non-Adiabaticity. https://doi.org/10.1143/jpsj.75.064708

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