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Proceedings Paper

Barkhausen noise, subloops, demagnetization curves, and universal scaling tuning disorder, field sweep rate, and history
Author(s): Karin A. Dahmen; John H Carpenter; Amit P Mehta; Andrea Christine Mills; James P. Sethna; Alex Travesset; Michael B. Weissman; Robert A White
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Paper Abstract

In previous work [1], which we recently reviewed in [2,3,4], we discovered a critical point in the behavior of hysteretic systems. Adding disorder to the system, we found a second order transition from hysteresis loops with a macroscopic jump or burst (roughly as seen in the supercooling of liquids) to smoothly varying hysteresis loops (as seen in most magnets). We have studied the critical point in the nonequilibrium zero temperature random field Ising model (RFIM) (which is a simple model for magnets, that has aplications far beyond magnetic hysteresis and associated Barkhausen Noise), using mean field theory, renormalization group techniques, and numerical simulations in 2,3,4, and 5 dimensions. In a large region near the critical disorder the model exhibits power law distributions of noise (avalanches), universal behavior, and a diverging length scale [5,6,7].

Paper Details

Date Published: 25 May 2004
PDF: 3 pages
Proc. SPIE 5469, Fluctuations and Noise in Materials, (25 May 2004); doi: 10.1117/12.546869
Show Author Affiliations
Karin A. Dahmen, Univ. of Illinois/Urbana-Champaign (United States)
John H Carpenter, Univ. of Illinois/Urbana-Champaign (United States)
Amit P Mehta, Univ. of Illinois/Urbana-Champaign (United States)
Andrea Christine Mills, Univ. of Illinois/Urbana-Champaign (United States)
James P. Sethna, Cornel Univ. (United States)
Alex Travesset, Iowa State Univ. (United States)
Michael B. Weissman, Univ. of Illinois/Urbana-Champaign (United States)
Robert A White, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 5469:
Fluctuations and Noise in Materials
Dragana Popovic; Michael B. Weissman; Zoltan A. Racz, Editor(s)

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