Abstract
To study the influence of thermal fluctuation in perpendicular recording media, we investigated a new incoherent magnetization model and combined it with the Langevin equation method. In our model, the energy barrier for magnetization reversal is reduced by using an incoherent reversal process. We simulated the M-H curve and the torque curve for perpendicular media with small Hc/Hk values, and calculated the time decay of Mr due to thermal fluctuation in the perpendicular media. The results roughly agreed with the experimental values of the time decay.
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