Computer simulated model of thermomagnetic writing

A computer-simulation model that is based on the concept of domain wall motion has been developed to describe the thermomagnetic writing processes in rare-earth-transition-metal thin films. The equation of motion is derived from the Landau-Lifshitz-Gilbert equation. The model is different from other proposed models in the following respects: the transient diameter of the written domain is directly calculated; domain wall mobility, which is measured whenever possible, is used explicitly; and written domains of arbitrary shape can be simulated. The validity of this model was tested by comparing simulated results for GdTbCo films with experimental data taken by high-speed photography of thermomagnetically written domains. The simulation provides a good match to the experimentally observed domain growth rate.<
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