軟磁性材料 ナノ構造材料I「アモルファス材料·ナノクリスタル材料」

摘要

In addition to polycrystalline materials with magnetic softness such as Ni-Fe and Fe-Si-Al, a few kinds of nanometer-scale textures provide materials that exhibit significant magnetic softness. They are amorphous phases, nanocrystals and granular textures. The random anisotropy model that allows basic understanding of magnetic softness associated with these nanometer-scale textures is presented. The main content of this article is concentrated on amorphous alloys that are in the ultimate state of magnetic softness. The term "amorphous material" includes ribbons produced by roll spinning, thin wires by fiber spinning and thin films by sputtering. The specific features of magnetic softness of the individual materials will be described in detail.