A computational model of thermally activated high speed magnetisation reversal in longitudinal thin film media

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 equati...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1999-03, Vol.193 (1), p.245-248
Main Authors: Hannay, J.D, Walmsley, N.S, Chantrell, R.W
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
High speed switching
Intergranular exchange coupling
Magnetic properties and materials
Magnetic properties of monolayers and thin films
Magnetic properties of surface, thin films and multilayers
Physics
Thermal activation
Thin film
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Summary: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.
ISSN:0304-8853
DOI:10.1016/S0304-8853(98)00436-3