2017 年 41 巻 3 号 p. 52-57
We calculate the writing field dependence of the bit error rate for Gilbert damping constants of 0.1 and 0.01 in heat-assisted magnetic recording (HAMR) using a new model calculation. The attempt period used in the new model calculation is considered in detail. The writing properties are examined for various thermal gradients, linear velocities, and anisotropy constants. When the damping constant is equal to 0.1, write-error is smaller, and erasure-after-write is larger than that for 0.01 since the attempt period is short. The physical implication of the results is discussed. We also compare the results of the new model calculation and the conventionally used micromagnetic calculation. The overall tendencies of the results are the same. Therefore, the outline of the impact of the damping constant on the bit error rate in HAMR can be understood by the grain magnetization reversal probability and the attempt period used in the new model calculation.
