Critical Hysteresis from Random Anisotropy

Details Critical Hysteresis from Random Anisotropy Critical Hysteresis from Random Anisotropy

2003-11-17

arxiv.org/abs/cond-mat/0311393v2

Physical Review B 69, 212404 (2004)

Physics

Condensed Matter

Materials Science

four pages, revtex4; minor corrections in the text and typos corrected (published version)

Scientific paper

10.1103/PhysRevB.69.212404

Critical hysteresis in ferromagnets is investigated through a $N$-component spin model with random anisotropies, more prevalent experimentally than the random fields used in most theoretical studies. Metastability, and the tensorial nature of anisotropy, dictate its physics. Generically, random field Ising criticality occurs, but other universality classes exist. In particular, proximity to $\mathcal{O}(N)$ criticality may explain the discrepancy between experiment and earlier theories. The uniaxial anisotropy constant, which can be controlled in magnetostrictive materials by an applied stress, emerges as a natural tuning parameter.

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