Abstract
A number of glassy metal alloys with near‐zero magnetostriction have been found to exhibit perminvarlike properties of relatively constant permeability at low magnetic fields and constricted BH loops. A wide variety of perminvar properties can be obtained by varying heat‐treatment conditions and the compositions of the materials. The low field permeability and dc coercivity of the glassy alloy perminvars can range between about 600 and 90 000 and between about 0.2 and 12 A/m, respectively. The magnetic shock problem associated with the crystalline perminvars is absent in these materials.

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