Abstract
The soft magnetic properties of Co-based amorphous Co 66 Fe 4 Ni 1 Si 15 B 14 alloy in terms of various annealing conditions have been investigated by magnetoimpedance (MI) effect and permeability ratio (PR). In order to enhance the soft magnetic properties by co-reducing internal thermal stress and magnetic ordering, we applied the furnace cooling to Curie temperature and subsequent water quenching (F&W) method, which considerably increased the initial permeability - to values 60% or 100% higher than in the only furnace-cooled (FC) or water-quenched samples, respectively. However, the MI and PR results show that the FC sample is softer than the F&W sample at high frequencies.
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