時間を考慮した有限温度における記録・再生シミュレーション : 磁気記録再生特性

概要

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In order to study the thermal stability of magnetic recording media, a hysteresis model of a medium at finite temperatures is proposed, based on an ensemble of non-interacting Stoner-Wohlfarth single-domain particles. The model takes into consideration the switching rate of each particle by using the Neel-Arrhenius law and the master equation. Using this model, a finite-element numerical read/write (R/W) simulation is performed by solving the Poisson equation for the two-dimensional model of a thin-film head and longitudinal media system. As a result, the output voltages at 77 kBPI and 141 kBPI at room temperature are found to be reduced linearly with the logarithmic time, on account of the thermal energy. In addition, the slope of the output voltage reduction is much larger for media with a lower K_uV/k_BT, a finding consistent with experimental results. R/W simulation using the proposed model may be useful for evaluating the thermal stability of the recording medium.
社団法人日本磁気学会の論文
2002-04-01