The micromagnetic model of a perpendicular magnetic recording medium was studied by computer simulation which reproduced measured magnetization curves. It was found that the coercivity of the perpendicular medium is much decreased by thermal fluctuation and depends strongly on the frequency of the applied field. The coercivity calculated by means of a two-layer model including a surface layer with weak magnetic anisotropy was close to the coercivity measured at room temperature. The applied field frequency dependence and the temperature dependence of the magnetic properties calculated under thermal fluctuation should be compared with the experimental results.
展开▼
