Abstract
A significant source of media noise in thin-film granular systems is intergranular exchange coupling. This important interaction between grains in longitudinal recording media has been studied by well-established ΔM(H) techniques. In this study, micromagnetic calculation using a Monte Carlo simulation has been carried out to confirm the validity of such a technique for perpendicular media. A recently developed demagnetization correction method is applied to a series of alloy perpendicular media, and subsequently, the exchange interactions in these films are studied using the ΔM(H) technique. With increasing film thickness, ΔM(H) changes from positive to negative, indicating a reduction of the exchange interaction in thicker films. This reduction is attributed to a stronger exchange coupling between grains at the initial stage of the film growth.
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