Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-12-11
Physics
Condensed Matter
Statistical Mechanics
8pages, 6 figures
Scientific paper
10.1103/PhysRevB.65.224404
We analyze the demagnetization properties of the random-field Ising model on the Bethe lattice focusing on the beahvior near the disorder induced phase transition. We derive an exact recursion relation for the magnetization and integrate it numerically. Our analysis shows that demagnetization is possible only in the continous high disorder phase, where at low field the loops are described by the Rayleigh law. In the low disorder phase, the saturation loop displays a discontinuity which is reflected by a non vanishing magnetization m_\infty after a series of nested loops. In this case, at low fields the loops are not symmetric and the Rayleigh law does not hold.
Colaiori Francesca
Gabrielli Andrea
Zapperi Stefano
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