Method of measuring anisotropy field of a recording medium investigated by computer simulation

Publisher Website
Google Scholar
Abstract
Three methods of measuring anisotropy field of a recording medium with the easy directions in the film plane were examined by computer simulation: (1) applying magnetic fields in a direction slightly tilted from the hard direction of the medium, (2) using rotational hysteresis loss, (3) applying perpendicular field to the film plane. The anisotropy fields obtained with these methods were smaller than the intrinsic anisotropy fields of grains (or particles). A method is proposed for obtaining the intrinsic anisotropy field of grains. In this method, magnetic torques are measured out-of-plane of a film. A method, which is an extension of the above method (1), for measuring the distribution of easy direction, is also examined and a revised method is proposed.