2018 年 42 巻 5 号 p. 110-118
Work on increasing writing field sensitivity can be divided into four problems with some related calculation parameters when we consider the physical implications of applying our model calculation to heat-assisted magnetic recording. The four problems are write-error, erasure-after-write, statistics, and damping constant. The dependence of the bit error rate on writing field is calculated for various calculation parameters. As a result of optimization after considering the four problems, when the Gilbert damping constant is 0.1, writing is easy since the attempt period is short. A writing field of about 8 kOe is necessary if we are to realize 4 Tbpsi and a linear velocity of 10 m/s. On the other hand, when the damping constant is 0.01, writing is difficult since the attempt period is long. We need a writing field of about 13 kOe to achieve 2 Tbpsi and a linear velocity of 5 m/s under the conditions used in this study.
