Zero-temperature random-field Ising model on a bilayered Bethe lattice

Thomas P Handford, Francisco J Pérez-Reche, Sergei N Taraskin

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Abstract

The zero-temperature random-field Ising model is solved analytically for magnetization versus external field for a bilayered Bethe lattice. The mechanisms of infinite avalanches which are observed for small values of disorder are established. The effects of variable interlayer interaction strengths on infinite avalanches are investigated. The spin-field correlation length is calculated and its critical behavior is discussed. Direct Monte Carlo simulations of spin-flip dynamics are shown to support the analytical findings. We find, paradoxically, that a reduction of the interlayer bond strength can cause a phase transition from a regime with continuous magnetization reversal to a regime where magnetization exhibits a discontinuity associated with an infinite avalanche. This effect is understood in terms of the proposed mechanisms for the infinite avalanche.
Original languageEnglish
Article number022117
Number of pages12
JournalPhysical Review. E, Statistical, Nonlinear and Soft Matter Physics
Volume88
Issue number2
DOIs
Publication statusPublished - 12 Aug 2013

Keywords

  • cond-mat.stat-mech

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