熱揺らぎを考慮した必要記録ヘッド磁界の検討

抄録

The optimum writing field at finite temperatures was simulated by using the Langevin equation, in the conditions where the recording density was constant (= 200 kfci) and the velocity was varied from 5 m/s to 100 m/s. In the higher-frequency range over 350 MHz, the optimum writing field does not depend on the thermal effect, but is determined by the magnetic anisotropy field Hk. We also studied the dependence of the optimum writing field on the distribution of the anisotropy field (Hk) and the easy axis orientation. The optimum writing field increases with increasing variance of Hk, but does not depend on the distribution of the anisotropy axis orientation.