Abstract
Two kinds of magnetic annealing are studied for zero-magnetostriction ( FeCo) 76.5 + 6.2 z ( Si z B 1 − z ) 23.5 − 6.2 z alloys having different [Si]/([Si] + [B]) ratios ( z = 0−0.5) and the same saturation induction of 10.5 kG. By static field annealing, the value of initial permeability μ 1 at 1 kHz falls below 1000 for all the alloys. By rotating field annealing, μ 1 for z = 0.4 exceeds 10 000. The highest μ 1 alloy of (Fe 0.067Co 0.933) 79 (Si 0.4B 0.6) 21 has μ 1 = 12 000, H c = 11 mOe and Br = 3.8 kG. The preferable [Si]/([Si] + [B]) ratio z for higher μ 1 (above 10 000) is between 0.35 and 0.5.
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