TITLE

Subloops, Barkhausen noise, and disorder induced critical behavior

AUTHOR(S)

Carpenter, John H.; Dahmen, Karin A.; Sethna, James P.; Friedman, Gary; Loverde, Sharon; Vanderveld, Ali

PUB. DATE

June 2001

SOURCE

Journal of Applied Physics;6/1/2001, Vol. 89 Issue 11, p6799

SOURCE TYPE

Academic Journal

DOC. TYPE

Article

ABSTRACT

Hysteresis loops are often seen in experiments at first order phase transformations when the system goes out of equilibrium, such as in the supercooling of liquids and in magnets. The nonequilibrium, zero-temperature random-field Ising model has been studied as a model for the hysteretic behavior of these transformations. As disorder is added, one finds a transition where the jump in the saturation hysteresis loop (corresponding to an infinite avalanche) decreases to zero. At this transition the model exhibits power law distributions of noise (avalanches), universal behavior, and a diverging length scale [O. Perkovic, K. Dahmen, and J. P. Sethna, Phys. Rev. B 59, 6106 (1999)]. Interestingly, not only the saturation loops but also subloops reflect this critical point, and at the critical disorder one finds history-induced critical scaling. We present simulation results for histories in systems of almost 14 million spins. Concentric inner subloops are found to resemble re! scaled saturation loops at effectively higher (possibly correlated) disorder. In addition, avalanche size distributions for the inner subloops are collapsed using Widom scaling methods. The resulting exponents and scaling functions are shown to differ from those corresponding to the saturation loop. � 2001 American Institute of Physics.

ACCESSION #

4712333

Tags: HYSTERESIS loop;  MAGNETIC induction

 

Related Articles

• Modeling of quasistatic magnetic hysteresis with feed-forward neural networks. Makaveev, Dimitre; Dupr�, Luc; De Wulf, Marc; Melkebeek, Jan // Journal of Applied Physics;6/1/2001, Vol. 89 Issue 11, p6737 

  A modeling technique for rate-independent (quasistatic) scalar magnetic hysteresis is presented, using neural networks. Based on the theory of dynamic systems and the wiping-out and congruency properties of the classical scalar Preisach hysteresis model, the choice of a feed-forward neural...

• Interaction between supply circuits and hysteretic cores under rotational flux excitations. Bottauscio, O.; Chiampi, M.; Ragusa, C.; Rege, L.; Repetto, M. // Journal of Applied Physics;6/1/2001, Vol. 89 Issue 11, p6725 

  An advanced model, coupling the electric supply circuits with the electromagnetic field and including scalar and vector Preisach model of hysteresis, is presented in this article. The model is based on the finite element solution of the two-dimensional field problem, through the development of...

• New Preisach-type models of hysteresis and their experimental testing. Mayergoyz, I. D.; Adly, A. A.; Friedman, G. // Journal of Applied Physics;5/1/1990, Vol. 67 Issue 9, p5373 

  Discusses the Preisach-type models of scalar hysteresis. Reason that the Preisach-type model was termed nonlinear or input-dependent model; Description of the modification made to the congruency property of minor loops; Discussion on how numerical integration can be avoided.

• Hysteresis-loop representation for strain energy calculation and fatigue assessment. Scott-Emuakpor, O.; George, T.; Cross, C.; Shen, M.-H. Herman // Journal of Strain Analysis for Engineering Design (Professional ;May2010, Vol. 45 Issue 4, p275 

  Improvements have been made to the cyclic strain energy density expression used in a fatigue life prediction method. The theory behind the prediction method is based on the understanding that the same amount of strain energy is dissipated during a monotonic fracture and a cyclic fatigue process....

• In-plane reorientation of magnetization in epitaxial exchange biased Fe/MnPd bilayers. Qing-feng Zhan; Krishnan, Kannan M. // Applied Physics Letters;3/15/2010, Vol. 96 Issue 11, p112506 

  We investigated the in-plane reorientation of magnetization in epitaxial Fe/MnPd bilayers. The samples with various thicknesses of MnPd and Fe layers present a conventional square and an unusual two-step exchange biased hysteresis loops at different temperature. The shape of the loops is...

• Preparation and electrical properties of high-Curie temperature ferroelectrics. B.-J. Fang; C.-L. Ding; W. Liu; L.-Q. Li; L. Tang // European Physical Journal - Applied Physics;Feb2009, Vol. 45 Issue 2, p20302 

  (1-x)Pb(Fe0.5Nb0.5)O3-xPb(Zr0.2Ti0.8)O3(PFN-PZT, x = 0.75, 0.80, 0.85) ferroelectric ceramics were prepared by conventional solid-state reaction method via the wolframite precursor route. XRD measurements confirmed that the synthesized PFN-PZT ceramics are of pure tetragonal perovskite...

• Micromagnetic simulation of spin-transfer switching in a full-Heusler Co2FeAl0.5Si0.5 alloy spin-valve nanopillar. Huang, H. B.; Ma, X. Q.; Liu, Z. H.; Meng, F. Y.; Xiao, Z. H.; Wu, P. P.; Shi, S. Q.; Chen, L. Q. // Journal of Applied Physics;Aug2011, Vol. 110 Issue 3, p033913 

  We investigated the spin-transfer switching in a full-Heusler Co2FeAl0.5Si0.5 alloy spin-valve nanopillar through micromagnetic simulation. A two-step switching hysteresis loop due to the fourfold in-plane magnetocrystalline anisotropy of Co2FeAl0.5Si0.5 layers was obtained. The simulation...

• Micromagnetic study of the intrinsic loop squareness S[sup *] in perpendicular media. Zhou, Hong // Journal of Applied Physics;5/15/2003, Vol. 93 Issue 10, p7843 

  Micromagnetic simulations have been performed to deshear the remanent hysteresis loops in perpendicular media. Results demonstrate that the intrinsic loop squareness S* increases with increasing the intergranular exchange couplings and with decreasing the intergranular magnetostatic...

• Computing the surface impedance in nonlinear materials with hysteresis. Bertoncini, F.; Cardelli, E.; Di Fraia, S.; Tellini, B. // Journal of Applied Physics;5/15/2003, Vol. 93 Issue 10, p6650 

  A numerical model in time domain for describing the energetic magnetic behavior of hysteretic materials is here proposed. Parallelogram shaped hysteresis loops have been used for simplifying the calculation. Equivalent major loops have been defined starting from the measured ones. Measurements...

Read the Article