Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/10564
Title: Magnetization-driven random-field Ising model at T=0
Author: Illa i Tortós, Xavier
Rosinberg, Martin-Luc
Shukla, Prabodh
Vives i Santa-Eulàlia, Eduard
Keywords: Materials magnètics
Propietats magnètiques
Model d'Ising
Histèresi
Magnetic materials
Magnetic properties
Ising model
Hysteresis
Issue Date: 2006
Publisher: The American Physical Society
Abstract: We study the hysteretic evolution of the random field Ising model at T= 0 when the magnetization M is controlled externally and the magnetic field H becomes the output variable. The dynamics is a simple modification of the single-spin-flip dynamics used in the H-driven situation and consists in flipping successively the spins with the largest local field. This allows one to perform a detailed comparison between the microscopic trajectories followed by the system with the two protocols. Simulations are performed on random graphs with connectivity z= 4 Bethe lattice and on the three-dimensional cubic lattice. The same internal energy U M is found with the two protocols when there is no macroscopic avalanche and it does not depend on whether the microscopic states are stable or not. On the Bethe lattice, the energy inside the macroscopic avalanche also coincides with the one that is computed analytically with the H-driven algorithm along the unstable branch of the hysteresis loop. The output field, defined here as U/ M, exhibits very large fluctuations with the magnetization and is not self-averaging. The relation to the experimental situation is discussed.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.74.224404
It is part of: Physical Review B, 2006, vol. 74, núm. 22, p. 224404-1-224404-10
Related resource: http://dx.doi.org/10.1103/PhysRevB.74.224404
URI: http://hdl.handle.net/2445/10564
ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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