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The magnetization within micrometer-size spots on Mn-Bi films was Curie-point switched with a laser in static applied magnetic fields. Such switching was found to be a continuous rather than a binary process, in that the average magnetization within a spot could be switched to any value between+Iₒand-Iₒby varying the applied field. The dependence of the magnetization after switching on field was measured quantitatively via the magnetooptic effect. Switched spots were examined under oil-immersion optics to reveal the magnetization distribution responsible for this dependence.
G. Lewicki (1969) studied this question.