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Abstract
A read/write simulation based on the Poisson equation by a finite element method was performed on keepered media (KM) with a thin soft magnetic layer (keeper layer) under a recording layer and a thin-film head. An extendedn Stoner-Wohlfarth (SW) model was used for the recording layers, in witch the switching rate of each SW particle at finite temperatures is taken into account using the Neel-Arrhenius law and the master equation.Thermal stability of the medium was estimated by the recorded magnetizations and the corresponding output voltage waveforms for 423 kBPI calculated at 300 K as a function of time t after the recording. Although the output voltage of the KM was slightly less than that of the conventional medium due to magnetic flux circulation through the keeper layer, the output voltage reduction rate due to thermal fluctuation decreased remarkably with a thin keeper layer.
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