Thermodynamic Behavior of a Nano-Sized Magnetic Grain near the Superparamagnetic Limit(<Special Issue>Recent Progress of High-Density Disk Storage)

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概要

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• A combined theory of the micromagnetic and Monte Carlo simulations is established to analyze the thermal property of a nano-sized magnetic grain. The Langevin equation of a grain's magnetic moment is the Landau-Lifshitz equation augmented by a "random-field" term representing the thermal-agitated force. The angular distribution of the magnetic moment of the grain is studied via its time evolution process. The switching of the magnetic moment vector between two energy-minimum states is observed. A simple analytical expression is obtained for the simulated attempt frequency fo, which is related to the magnetic constant of the nano-grain, and agrees well with the phenomenological value.

• 社団法人電子情報通信学会の論文
• 2003-09-01

著者

• Wei Dan

  Laboratory Of Advanced Materials Department Of Materials Science And Engineering Tsinghua University

• QIN Jian

  Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua Universi

• Qin Jian

  Laboratory Of Advanced Materials Department Of Materials Science And Engineering Tsinghua University

• WEI Dan

  Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University

関連論文

• Improvement of Read Back Properties in HDD with PRML Signal Processing Method(Recent Progress of High-Density Disk Storage)
• Medium Noise in Longitudinal Thin Film Disk Media above 20Gb/in^2(Special Issue on Selected Papers from the 4th Asian Symposium for Information Storage Technology)
• Thermodynamic Behavior of a Nano-Sized Magnetic Grain near the Superparamagnetic Limit(Recent Progress of High-Density Disk Storage)

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