The soft-magnetic strip is produced in FeNi alloys with a Ni content between 35 – 81%. The alloy Normaperm (35-40%) exhibits a particular increase in permeability in magnetic field strengths up to approx. 100 mOe. The alloys with 45-55% Ni have relatively high initial permeability and high induction saturation. The alloys with 76-81% Ni have high initial permeability values.
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