The soft magnetic properties of Co-based amorphous Co66Fe4Ni1Si15B14 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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Lee et al. (2002) studied this question.
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