Field-Driven Hysteresis of the d=3 Ising Spin Glass: Hard-Spin Mean-Field Theory

Details Field-Driven Hysteresis of the d=3 Ising Spin Glass: Hard-Spin Mean-Field Theory Field-Driven Hysteresis of the d=3 Ising Spin Glass: Hard-Spin Mean-Field Theory

2007-03-18

arxiv.org/abs/cond-mat/0703467v2

Phys. Rev. B 76, 014417 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 8 figures, 1 table. Replaced with published version

Scientific paper

10.1103/PhysRevB.76.014417

Hysteresis loops are obtained in the Ising spin-glass phase in d=3, using frustration-conserving hard-spin mean-field theory. The system is driven by a time-dependent random magnetic field H_Q that is conjugate to the spin-glass order Q, yielding a field-driven first-order phase transition through the spin-glass phase. The hysteresis loop area A of the Q-H_Q curve scales with respect to the sweep rate h of magnetic field as A-A_0 = h^b. In the spin-glass and random-bond ferromagnetic phases, the sweep-rate scaling exponent b changes with temperature T, but appears not to change with antiferromagnetic bond concentration p. By contrast, in the pure ferromagnetic phase, b does not depend on T and has a sharply different value than in the two other phases.

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