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A substantial increase in initial permeability as well as maximum permeability in 53% and 58% nickel—iron alloys after annealing at below the Curie temperature under a magnetic field was obtained. The permeability at 40 G was 38 000, and corresponding maximum permeability was 320 000. The response to magnetic annealing was observed to be dependent on secondary recrystallized textures, of which two kinds were observed. The texture of which the central cube pole of the cube texture rotated around [100] axis parallel to rolling direction showed good response to the magnetic annealing, while the texture of which the central cube pole of the cube texture rotated around [111] axis showed poor response to the magnetic annealing. The percentage increase of the permeability at 40 G is also shown to be dependent on the squareness of the hysteresis loop of specimens before the magnetic annealing. Increase in the permeability at 40 G could be explained by considering the relationship between the induced uniaxial anisotropy and the crystal anisotropy, and also by the reduced magnetostriction.

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