Magneto-optical investigation of near-surface micro-magnetic structure of FeNbCuSiB alloys

概要

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The results on the investigation of near-surface micro-magnetic structure of the as-cast and annealed at 550℃ for 1hr FeCuNbSiB ribbons are presented. The measurements were performed by using of the magneto-optical micro-magnetometer having the spatial resolution up to 〜0.3μm. The as-cast samples were amorphous and the annealed samples had nanocrystalline structure with typical grain sizes of 10 - 12 nm. The dispersion of magnetic anisotropy was discovered in the studied samples. As result, their local magnetic properties were inhomogeneous. The linear size of the magnetic inhomogeneities in the as-cast and annealed samples was equal to 〜 120 - 150 and 〜 50 - 70 μm, respectively. It was established that in the annealed samples the local initial magnetic permeability increases and the coercivity decreases (up to 10 times) with respect to those of the as-cast samples.
社団法人日本磁気学会の論文
1999-01-20