永久磁石回転式脱磁法の動作解析

概要

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Rotatingpermanent-magnets demagnetization is able to demagnetize a magnetized sample on the moving belt within comparatively short time. However, the operation principle of the demagnetization has not clarified yet.This paper discusses the mechanism of demagnetization and the relationship between structure of the demagnetizer and effect of demagnetization. The following points are obtained. (1) It is clarified experimentally that the mechanism of the demagnetization can be accounted for loop-attenuation demagnetization. A reasonable relationship between the demagnetizing frequency and the velocity of a sample is also proposed. (2) An empirical equation for demagnetization is shown analytically that three important parameters are closely related to the magnetized energies and the magnetic poles of the permanent-magnets.
社団法人日本磁気学会の論文
2003-05-01