Abstract
The extremely soft magnetic behavior in the nanocrystalline Fe 81B 11Nb 7Cu 1 alloy annealed at 450 and 550°C for 1 h, respectively, in a vacuum were obtained, and examined by means of the magnetoimpedance (MI) effect and the incremental permeability. Because the MI effect can be obtained only in ultra-soft magnetic materials, the improvement of magnetic softness by proper thermal treatment was carefully monitored by the MI effect for all annealed samples. The changes of the incremental permeability as a function of an external field were also measured to verify the magnetic softness along with the MI measurement. Our result show that the maximum value of magnetoimpedance ratio increases drastically in the sample annealed at 450 and 550°C indicating that the sample is ultra-softened by nanocrystallization.
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