Issues in Determining Activation Volume in Magnetic Recording Media

概要

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The field dependence of activation volume (V_a) is determined by four different methods for longitudinal recording media. For two methods using the irreversible magnetization, V_a increases with reversing fields up to the coercivity (H_c). The V_a determined from the time dependence of the total magnetization, which includes the reversible magnetization, yields the opposite behavior. The V_a is much larger at lower fields and decreases with reversing fields up to H_c. This difference is attributed to a difference between the total and irreversible magnetization, which is particularly significant for small reversing fields. Around H_c, the different methods yield comparable results. Furthermore, V_a is found to strongly depend on time.
社団法人日本磁気学会の論文
2002-05-01