Abstract
The Kerr magneto-optic effect has been used to observe domain structures on rings of 65% nickel-35% iron after annealing just below the Curie point with and without an external field being present. In general the observations are consistent with the Néel-Taniguchi theory of pair orientation, but measurements of wall movement in the constant-permeability region of the hysteresis loop of the baked alloy do not agree with predictions of theory.

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