Abstract
A computational model of thermally activated magnetisation reversal in longitudinal thin film recording media is described. We introduce thermal effects into the simulation by adding a random field term to the local field of each spin, thus converting the deterministic Landau–Lifshitz–Gilbert equation of motion into the stochastic Langevin equation of the problem. The model includes anisotropic crystalline, magnetostatic (dipole), and exchange interactions. Methods of perturbing and expanding a system of grains which initially form a regular lattice has given a physically realistic system of grains which lie on an isotropic physical structure having a log-normal grain size distribution and also a random distribution of in plane easy axes.
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