Abstract
It is shown that the anomalous magnetic behavior in low magnetic fields of annealed face-centered cubic nickel-cobalt alloys, as found previously by us(3, 4), can be explained in terms of the stabilization by the induced uniaxial anisotropy of domain walls(1, 2). The change of magnetic properties due to quenching from high temperatures have been measured, of which the main results are as follows: (1) The initial susceptibility increases with rising quenching temperature and reaches a maximum for quenching from temperatures near the Curie point, (2) the coercive force decreases appreciably and a maximum centered at about 50% Co in annealed state disappears completely, and (3) the anomalous magnetic behavior in annealed state disappears. These experimental facts have been shown to be explained by the disappearence due to quenching of the domain-wall stabilization. It is concluded that the magnetic properties of simple ferromagnetic cubic solid solutions are, indeed, sensitive to heat-treatment and the so-far presented domain theories are applicable only to solid solutions quenched from above the curieir temperatures.
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