円周方向高保磁力角形BH特性アモルファスワイヤの高感度MI効果

概要

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A new sensitive magneto-impedance (MI) effect was found in quenched FeCoSiB amorphous wire of 30 μm diameter, in which the wire impedance steeply increases from around the dc resistance value to a value almost three times higher with increase in the external applied field H_<ex>, even at a low frequency. The new MI etfect shows application of H_<ex> from the non-skin-effect case due to its large coercivity H_c (about 1.5 Oe), at which the circumferential permeability μ_θ is so small that the skin depth δ(= (2ρ/ωμ_θ)^ 1/2) is larger than the wire radius a, to the skin effect case with steep decrease of H_c (a steep increase of μ_θ) for H_<ex> applied vertical to the circumferential domain wall. On the other hand, the MI sensitivity in the quenched amorphous wire is low for a magnetizing current of dc-biased ac, because of its high magnetic anisotropy field H_k of about 3 Oe due to the nonexistence of domain walls.
社団法人日本磁気学会の論文
2000-04-15