Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3589968
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Funding
- Western Digital Corporation
- Natural Science and Engineering Research Council of Canada (NSERC)
- Atlantic Computational Excellence network (ACEnet)
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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. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3589968]
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