Numerical simulation of random magnetic anisotropy with solid magnetization grains
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概要
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Random anisotropy model (RAM) was investigated by means of numerical simulation. Magnetization of magnetically interacting grains with randomly oriented uniaxial anisotropy was calculated using the Landau–Lifshitz–Gilbert equation where the magnetization in a particular grain is assumed to align in the same direction (single spin model). Calculations were carried out for 10×10×10 three dimensional cells changing cell sizes from 5 to 25 nm. The relation between coercive forces and grain sizes was obtained to be HCnot, vert, similarD5.7 from the simulated magnetization curves. This result fits the primitive theory HCnot, vert, similarD6 and the experimental results.
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