Atomic level micromagnetic model of recording media switching at elevated temperatures

作者：Mercer J I^*; Plumer M L; Whitehead J P; van Ek J

来源：Applied Physics Letters, 2011, 98(19): 192508.

DOI：10.1063/1.3589968

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 nonuniform 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.

• 出版日期2011-5-9