Evaluating activation volume and inter-particle interaction for super-fine particle-coated media

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概要

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• Activation volume and inter-particle interaction were evaluated using super-fine Ba ferrite particle coated media, which were oriented or non-oriented. It was clarified that a peak value of ΔM plot, which was used for evaluation of inter-particle interaction, differs according to the degree of media orientation. The activation volumes of super fine particulate media were found to be 2 times as much as their physical volumes. This suggested that more than 2 particles are stacked and act together in magnetization reversal. An effective value of K_uV_<ac>/kT was also estimated. For media composed of super-fine Ba ferrite particles with diameter of about 22nm, K_uV_<ac>/kT values close to the critical value in thermal stability.

• 社団法人電子情報通信学会の論文
• 2001-11-01

著者

• Suzuki Toshiyuki

  Kyushu Institute of Design

• Tanaka Terumitsu

  Kyushu Institute of Design

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