Time decay of the remanent magnetization in longitudinal thin film recording media as a function of distributions of grain size and easy-axis orientation

A model incorporating a gamma distribution of grain size and a Gaussian distribution of easy-axis orientation was used to study the time dependence of remanent magnetization in thin film recording media. Numerical calculations give qualitative agreement with experimental results on the time decay of remanent magnetization in longitudinal thin film recording media. The performance of the writing process and long-term information storage were evaluated in terms of the grain size distribution, easy-axis orientation distribution and applied reverse magnetic field.