Abstract
To estimate the demagnetizing field in the recording layer of a double-layer perpendicular medium as a function of the thickness and permeability of the underlayer, a finite element simulation for an arctangent magnetization was performed by solving the Maxwell equation for a 2D model of a head and double-layer medium system, and compared with the demagnetizing field obtained from an analytical formula. In addition, a recorded magnetization and a demagnetizing field were simulated for an SPT head and double-layer medium system, and compared with those for the arctangent magnetization. As a result, it was found that the demagnetizing field decreases drastically due to the multiple images induced between the head and the underlayer, and that the recorded magnetization becomes asymmetrical as the coercive force of the recording layer decreases.
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