Numerical simulation of random magnetic anisotropy with solid magnetization grains

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:323

Article

Lee, S. -J.¹  Sato, S.¹  Yanagihara, H.¹  Kita, E.¹  Mitsumata, C.² 

[1] Univ Tsukuba, Inst Appl Phys, Tsukuba, Ibaraki 3058573, Japan

[2] Tohoku Univ, Grad Sch Engn, Dept Elect Engn, Sendai, Miyagi 9808579, Japan

关键词: Random magnetic anisotropy;    Micromagnetic simulation;    Single domain;    Coercive force;    Exchange interaction;   

DOI  :  10.1016/j.jmmm.2010.08.015

来源: Elsevier

【 摘 要 】

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 x 10 x 10 three dimensional cells changing cell sizes from 5 to 25 nm. The relation between coercive forces and grain sizes was obtained to be H-C similar to D-5:7 from the simulated magnetization curves. This result fits the primitive theory H-C similar to D-6 and the experimental results. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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