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Vol.25, No.2, 116 ~ 125, 1987

Title

The Effects of Nb Addition and Annealing Conditions on the Magnetic Domain and Properties of Fe - Based Amorphous Alloys

최진학J . H . Choi, 송진태J . T . Song

Abstract

The effect of Nb element and annealing condition on the magnetic domain properties were investigated in Fe_(80)B_(16)Si₄(at %) amorphous alloy which has high saturation magnetization and low core loss. With increasing Nb contents in (Fe_(1-x)Nb_x)(80)B_(16)Si₄(x=0-0.10) amorphous alloy ribbons, the crystallization temperature increased from 448℃ to 542℃ and soft magnetic properties were improved by decreasing coercive force and increasing maximum permeability. These improvements were attributed to the decreasing of magnetostriction and the reduction of domain width by Nb addition. The annealing treatment also improved the soft magnetic properties of (Fe_(1-x)Nb_x)_(80)B_(16)Si₄ amorphous alloys and the optimum annealing temperature was 425℃-450℃. (Fe_(0.92)Nb_(0.08))_(80)B_(16)Si₄. and (Fe_(0.90)Nb_(0.10))_(80)B_(16)Si₄, amorphous alloys which were annealed at these temperatures had low coercive force and high maximum magnetic permeability. It could be thought that these improvements were attributed to the relaxation of internal stress and were related to the disappearance of maze domain and the for mation of 180˚ domain.

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