鉄基低磁歪非晶質合金の透磁率と熱安定性

抄録

Magnetic permeability and its thermal stability have been investigated in low magnetostrictive amorphous Fe-based alloys. Crystallization temperature, Curie temperature, saturation magnetization, and effective permeability up to 1 MHz have been measured. A value for the effective permeability of 2×10⁴ is obtained at 1 kHz for Fe-based amorphous alloys with low magnetostriction of the 10^-6 order, which is comparable to the value of zero magnetostrictive Co-based amorphous alloys.
Disaccommodation and thermal variation of magnetic permeability have been also measured. Small disaccommodation, good thermal stability, are achieved in low magnetostrictive Fe-based amorphous alloys.
Disaccommodation, however, is not directly proportional to λ_s² in the 10^-6 range of magnetostriction, suggesting that the magnetostrictive model of Allia is not valid in low magnetostrictive Fe-based amorphous alloys. Even for Fe-based amorphous alloys, disaccommodation should be considered in terms of induced magnetic anisotropy, in addition to the magnetostriction.