Illa i Tortós, XavierRosinberg, Martin-LucVives i Santa-Eulàlia, Eduard2009-12-282009-12-2820060163-1829https://hdl.handle.net/2445/10563We investigate the influence of the driving mechanism on the hysteretic response of systems with athermal dynamics. In the framework of local mean-field theory at finite temperature (but neglecting thermally activated processes), we compare the rate-independent hysteresis loops obtained in the random field Ising model when controlling either the external magnetic field H or the extensive magnetization M. Two distinct behaviors are observed, depending on disorder strength. At large disorder, the H-driven and M-driven protocols yield identical hysteresis loops in the thermodynamic limit. At low disorder, when the H-driven magnetization curve is discontinuous (due to the presence of a macroscopic avalanche), the M-driven loop is reentrant while the induced field exhibits strong intermittent fluctuations and is only weakly self-averaging. The relevance of these results to the experimental observations in ferromagnetic materials, shape memory alloys, and other disordered systems is discussed.10 p.application/pdfeng(c) The American Physical Society, 2006HistèresiModel d'IsingMecànica estadísticaHysteresisIsing modelStatistical mechanicsinfo:eu-repo/semantics/article546515info:eu-repo/semantics/openAccess