DISORDER-DRIVEN 1ST-ORDER PHASE-TRANSFORMATIONS - A MODEL FOR HYSTERESIS

被引:15
作者
DAHMEN, K
KARTHA, S
KRUMHANSL, JA
ROBERTS, BW
SETHNA, JP
SHORE, JD
机构
[1] Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca
关键词
D O I
10.1063/1.355522
中图分类号
O59 [应用物理学];
学科分类号
摘要
Hysteresis loops in some magnetic systems are composed of small avalanches (manifesting themselves as Barkhausen pulses). Hysteresis loops in other first-order phase transitions (including some magnetic systems) often occur via one large avalanche. The transition between these two limiting cases is studied, by varying the disorder in the zero-temperature random-field Ising model. Sweeping the external field through zero at weak disorder, we get one large avalanche with small precursors and aftershocks. At strong disorder, we get a distribution of small avalanches (small Barkhausen effect). At the critical value of disorder where a macroscopic jump in the magnetization first occurs, universal power-law behavior of the magnetization and of the distribution of (Barkhausen) avalanches is found. This transition is studied by mean-field theory, perturbative expansions, and numerical simulation in three dimensions.
引用
收藏
页码:5946 / 5948
页数:3
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