動的磁壁画像の可視化による強磁性体の磁化特性と 1 / f ゆらぎ周波数特性

Abstract

Bitter method is most commonly observing way of the magnetic domains even though it is limited to the surface of specimen. To observe the magnetic domains by Bitter method, a drop of magnetic liquid is put on a target magnetic material surface after electrical field polishing processes. Applying magnetic field to this magnetic material covered by magnetic fluid makes it possible to observe the magnetic domain dynamics by a microscope. We have previously reported that local magnetization characteristics could be obtained from the visualized magnetic domain dynamics. Final purpose of our research on visualized magnetic domain dynamics is to work out a fully automatic quality control system. And also, we plan to deduce some rules governing the magnetic domain dynamics system from the visualized thin magnetic materials domain dynamics. Present paper, we try to visualize the magnetic domain wall dynamics of ferromagnetic materials when applying not only the anhysteretic magnetizing condition but also mechanical stress. We try to extract 1/f as well as 1/f fluctuating frequency characteristics from the magnetic domain wall dynamics, where α is the generalization of 1.