Ferromagnetic state and phase transitions

TL;DR

This paper challenges the traditional exchange field theory of ferromagnetism, proposing a new approach based on crystal fields and structural rearrangements involving nucleation and interface propagation.

Contribution

It introduces a novel perspective linking ferromagnetic phase transitions directly to structural changes, replacing the classical exchange field theory.

Findings

Standard exchange field theory is unsupported by evidence.

Ferromagnetic transitions involve structural rearrangements.

Magnetization is associated with crystal structural changes.

Abstract

Evidence is summarized attesting that the standard exchange field theory of ferromagnetism by Heisenberg has not been successful. It is replaced by the crystal field and a simple assumption that spin orientation is inexorably associated with the orientation of its carrier. It follows at once that both ferromagnetic 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 coherently for ferromagnetic state and its manifestations.