Effect of shape anisotropy on threshold current density for current-induced domain wall motion
2007; American Institute of Physics; Volume: 90; Issue: 25 Linguagem: Inglês
10.1063/1.2750404
ISSN1520-8842
AutoresSoo-Man Seo, Kyung‐Jin Lee, Woojin Kim, Taek-Dong Lee,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoUsing micromagnetic simulations, the authors investigate the effects of the shape anisotropy of nanowires on the threshold current density (JC) in the adiabatic limit. It is observed that the type of domain wall significantly affects the dependence of JC on the shape anisotropy. For a transverse wall, JC is proportional to the shape anisotropy, but slightly deviates from the theoretical prediction [G. Tatara and H. Kohno, Phys. Rev. Lett. 92, 086601 (2004)] possibly due to antivortex formation. For a vortex wall, JC is almost independent of the shape anisotropy, as experimentally observed [A. Yamaguchi et al., Jpn. J. Appl. Phys. Part 1 45, 3850 (2006)]. Interestingly, JC and the velocity of the vortex wall at finite temperatures are in good agreement with the experimental values even when the nonadiabatic spin torque is not considered.
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