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.

arXiv comment4 pages, 5 figures

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• Spin-Wave-Assisted Thermal Reversal of Epitaxial Perpendicular Magnetic Nanodots
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Cited by in corpus (6)

• Magnetization dynamics at elevated temperatures
• Dipolar ferromagnetism in three-dimensional superlattices of nanoparticles
• Micromagnetic simulations of sweep-rate dependent coercivity in perpendicular recording media
• Coarse-graining in micromagnetic simulations of dynamic hysteresis loops
• Selection of a Stochastic Landau-Lifshitz Equation and the Stochastic Persistence Problem
• Long time behaviour of a stochastic nano particle