Critical Hysteresis from Random Anisotropy

Abstract

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.

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

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Cited by in corpus (4)

• Ground state optimization and hysteretic demagnetization: the random-field Ising model
• Critical Hysteresis in Random Field XY and Heisenberg Models
• Hysteresis in Random Field XY and Heisenberg Models: Mean Field Theory and Simulations at Zero Temperature
• Hysteresis in Anti-Ferromagnetic Random-Field Ising Model at Zero Temperature