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The dynamic process of assisted magnetic switchins has been simulated toinvestigate the associated physics. The model uses a Voronoi construction todetermine the physical structure of the nano granular thin film recordingmedia; and the Landau-Lifshitz-Bloch (LLB) equation is solved to evolve themagnetic system in time. The reduction of the magnetization is determined overa range of peak system temperatures and for a number of anisotropy values. Theresults show that the HAMR process is not simply magnetization reversal over athermally reduced energy barrier. To achieve full magnetization reversal (forall anisotropies investigated) an applied field strength of at least 6kOe isrequired and the peak system temperature must reach at least the Curie point(Tc). When heated to Tc the magnetization associated with each grain isdestroyed, which invokes the non-precessional linear reversal mode. Reversingthe magnetization through this linear reversal mode is favourable, as thereversal time is two orders of magnitude smaller than that associated withprecession. Under these conditions, as the temperature decreases to ambient,the magnetization recovers in the direction of the applied field, completingthe reversal process. Also the model produces results which are consistent withthe concept of thermal writability; when heating the media to Tc, the smallergrains require a larger field strength to reverse the magnetization.

Micromagnetic Modelling of the Heat Assisted Switching Process in high Anisotropy FePt Granular Thin Films