Micromagnetic computation for wall coercivity caused by magnetic nonuniformity
作者： K. Matsuyama , Y. Hirokado , H. Asada
DOI: 10.1063/1.348226
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摘要: The wall coercivity caused by the magnetic nonuniformity has been studied numerically. Landau‐Lifshits‐Gilbert (LLG) equation is integrated an explicit scheme of modified Dufort‐Frankel method. computation was carried out for a two‐dimensional grid system representing magnetization direction in film plane. Typical parameters magneto‐optic recording media were assumed. Spatial variations uniaxial anisotropy treated as nonuniformity. validity our numerical approach demonstrated with preliminary one‐dimensional computations, compared to analytical solutions. A coercive field 2.5 kOe observed coupling pinning site (30‐A width and 360‐A spacing along wall) 10 times larger ordinary region. variation (K=106–107 erg/cm3) wavelength than 60 also on order 1 kOe, those media. It found that fine 100 notable bubble domain surrounding it.
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