Writing Field Sensitivity in Heat-Assisted Magnetic Recording

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  • Kobayashi T.
    Graduate School of Engineering, Mie Univ.
  • Nakatani Y.
    Graduate School of Informatics and Engineering, Univ. of Electro-Communications
  • Fujiwara Y.
    Graduate School of Engineering, Mie Univ.

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<p>  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.</p>

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