A SIMULATION OF ROTATION MAGNETIZATION PROCESSES IN LONGITUDINAL THIN-FILM MEDIA

The effect of the local demagnetizing field on the rotation magnetizat ion processes in Go-based alloy longitudinal thin-film media was studi ed as a simple approach to understanding the correlation between the m edium coercivity and the strength of the in-plane easy axis crystallog raphic texture. The rotation magnetization of a single domain particle with uniaxial anisotropy in a thin film was simulated without and wit h the effect of a uniform local demagnetizing field. Longitudinal thin -film media were then modeled as assemblies of non-interacting single domain particles with various easy axis distributions, and the demagne tizing field was found to decrease the in-plane coercivity as the easy axes of an increasing fraction of the grains are tilted out of the fi lm plane. The rotational hysteresis remains a valid method of measurin g the anisotropy field after considering the demagnetizing effect.