Role of dipolar interactions in the determination of intrinsic switching field distributions in perpendicular recording media

The $\Delta H(M,\Delta M)$ method and its ability to determine the intrinsic switching field distributions of perpendicular recording media are numerically studied with the coupled hysteron model. It is found that the presence of dipolar interactions with strength of practical recording media enhances the reliability of the $\Delta H(M,\Delta M)$ method. The correlation between the fit quality measure and the deviation from redundancy measure indicates that the latter, which can be determined from experimental data alone, is a good predictor of the reliability.