Heat treatment in a magnetic field has been found effective for iron-silicon alloys between two percent and ten percent silicon, the highest maximum permeability being obtained at about 6.5 percent silicon. In a single crystal of this composition, magnetized parallel to a [100] direction, the hysteresis loop is squared by the magnetic anneal and the maximum permeability is increased from 50,000 to 3,800,000, the highest value yet reported.
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Matilda Goertz (1951) studied this question.