Calculations of the angular dependence of apparent and true coercivities of thin film magnetic recording media

Calculated hysteresis loops and the angular dependence of coercivity for coherent rotation and incoherent curling and fanning rotations in thin-film magnetic recording media modeled as a single-particle are presented with the effects of demagnetization fields (H_d) taken into account by two methods. The true coercivity is obtained from measurements with a full correction for H_d. The apparent coercivity is obtained when a correction for H_d is made only in the direction of applied external field. However, the apparent coercivity is still useful for investigating the angular dependence of micromagnetization reversal mechanisms