Abstract
We have found that the domain structure of a 40% cobalt-nickel single crystal is very small-scaled and complicated in the annealed state as compared with that of ordinary ferromagnetic substances but it becomes simpler and larger after quenching from above the Curie temperature, indicating that the domain structure of a cubic solid solution can be affected by the induced uniaxial anisotropy. It is shown that these findings, together with the results of considerations reported previously, lead us to the conclusion that the Perminvar-type magnetic properties are due to the stabilization of domain walls by the induced uniaxial anisotropy in face-centered cubic solid solutions and in body-centered cubic solid solutions with negative cubic anisotropy constants.
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