Abstract
Ev idence is summarized attesting that the standard exchange field theory of ferro magnetism by Heisenberg has not been successful. It is replaced by the crystal field and a natural assumption that spin orientation is inexo rably associated with the orientation of its carrier. It follows at once that ferro magnetic state is a property of the crystal structure and that both ferro magnetic phase transitions and magnetization must involve a structural rearrangement. The mechanism of structural rearrangements in solids is nucleation and interface propagation. The new approach accounts consistently for ferro magnetic state and its manifestations.
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