Atomic level micromagnetic model of recording media switching at elevated temperatures

Abstract

An atomic level micromagnetic model of granular recording media is developed and applied to examine external field-induced grain switching at elevated temperatures which captures non-uniform reversal modes. The results are compared with traditional methods which employ the Landau-Lifshitz-Gilbert equations based on uniformly magnetized grains with assigned intrinsic temperature profiles for $M(T)$ and $K(T)$. Using nominal parameters corresponding to high-anisotropy FePt-type media envisioned for Energy Assisted Magnetic Recording, our results demonstrate that atomic-level reversal slightly reduces the field required to switch grains at elevated temperatures, but results in larger fluctuations, when compared to a uniformly magnetized grain model.

4 pages, 5 figures

References in corpus (2)

• Dynamic approach for micromagnetics close to the Curie temperature
• Micromagnetic simulations of interacting dipoles on a fcc lattice: Application to nanoparticle assemblies