With increase in recording density of HDD, to deposit a recording medium as designed and also to evaluate whether the medium is or not become more important. In the previous work, we reported that differentiation of the in-plane magnetization Min on the field 4pi d(Min)/dH is informative and an additional peak at 0-field reflect a condition of the initial layer by comparing experimental data and computer-simulated results [1]. However, values of media parameters such as inter-grain exchange coupling at the initial layer were not estimated.
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