2003/11/30 by Rava A. da Silveira, Rava Azeredo da Silveira, Stefano Zapperi · 1 citation
Materials Science · Physics and Astronomy · #Magnetic Properties and Applications #Magnetic properties of thin films #Theoretical and Computational Physics #cond-mat.dis-nn #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.69.212404
published as Physical Review B 69, 212404 (2004) · four pages, revtex4; minor corrections in the text and typos corrected (published version)
openalex publication_date 2004/06/17 · arxiv created 2004/07/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 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.