Magnetic moment of square SIS Josephson arrays: Self-organized criticality

Matizen, É. V.; Ishikaev, S. M.; Oboznov, V. A.

doi:10.1134/1.1842888

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…Such scale-free behavior indicates a critical avalanche-like character of magnetization reversal in ferromagnet materials. It is noteworthy that similar scaling behavior is often found for dynamical systems of different nature -vortex avalanches in superconductors [6], dry friction [7], discontinuous plastic flow [8], and so on.…”

Section: Itsupporting

confidence: 67%

Statistical and Multifractal Properties of Barkhausen Jumps in Exchange-Coupled Antiferromagnetic/Ferromagnetic Bilayers

Шашков

Lebyodkin

Gornakov

2014

SSP

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Statistical and multifractal properties of Barkhausen jumps in exchange-coupled ferromagnet/antiferromagnet bilayers are studied on Co/IrMn and NiFe/NiO heterostructures using a magneto-optical indicator film technique. The statistical analysis proves a nonstochastic character of magnetization jumps. In particular, power-law behavior is observed for Co/IrMn samples. Furthermore, the statistics depends on the ferromagnet layer thickness and antiferromagnet layer material structure. The average jump size displays an asymmetry between the forward and backward branches of the hysteresis loop, particularly pronounced for the structure with a thin Co layer. In spite of the observation of such an asymmetry in the activity of the domain nucleation and pinning centers, the statistical distributions of jumps do not show any significant differences for two branches of the hysteresis loop. The conclusion on a nonrandom character of the magnetization process is supported by the multifractal analysis which reveals the presence of correlations in the time arrangement of the Barkhausen jumps.

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Section: Itsupporting

confidence: 67%

Statistical and Multifractal Properties of Barkhausen Jumps in Exchange-Coupled Antiferromagnetic/Ferromagnetic Bilayers

Шашков

Lebyodkin

Gornakov

2014

SSP

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“…The occurrence of power-law statistics in the observed behavior is reminiscent of similar features in numerous nonlinear systems of various natures. Well known examples include physical objects, such as the Barkhausen noise in magnetic materials [60] or vortex avalanches in superconductors [61], as well as mechanical or cognate systems, e.g. fracture [42,62], martensitic transformations [63], dry friction [6] or earthquakes [54], and plastic instability due to mechanisms other than the PLC effect [26,64].…”

Section: Synchronization Of Dislocation Avalanchesmentioning

confidence: 99%

On the similarity of plastic flow processes during smooth and jerky flow: Statistical analysis

et al. 2012

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Jerky flow in dilute alloys, or the Portevin-Le Chatelier effect, is investigated using statistical analysis of time series characterizing the evolution of the plastic activity at distinct scales of observation, namely, the macroscopic scale of stress serrations and a mesoscopic scale pertaining to the accompanying acoustic emission. Whereas the stress serrations display various types of statistical distributions depending on the driving strain rate, including power-law, peaked and bimodal histograms, it is found that acoustic emission is characterized by power-law statistics of event size in all experimental conditions. The latter reflect intermittency and self-organization of plastic activity at a mesoscopic scale. This shift in the observed dynamics when the observation length scale is decreased is discussed in terms of the synchronization of small-scale events.

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Role of superposition of dislocation avalanches in the statistics of acoustic emission during plastic deformation

et al. 2013

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Various dynamical systems with many degrees of freedom display avalanche dynamics, which is characterized by scale invariance reflected in power-law statistics. The superposition of avalanche processes in real systems driven at a finite velocity may influence the experimental determination of the underlying power law. The present paper reports results of an investigation of this effect using the example of acoustic emission (AE) accompanying plastic deformation of crystals. Indeed, recent studies of AE did not only prove that the dynamics of crystal defects obeys power-law statistics, but also led to a hypothesis of universality of the scaling law. We examine the sensitivity of the apparent statistics of AE to the parameters applied to individualize AE events. Two different alloys, MgZr and AlMg, both displaying strong AE but characterized by different plasticity mechanisms, are investigated. It is shown that the power-law indices display a good robustness in wide ranges of parameters even in the conditions leading to very strong superposition of AE events, although some deviations from the persistent values are also detected. The totality of the results confirms the scale-invariant character of deformation processes on the scale relevant to AE, but uncovers essential differences between the power-law exponents found for two kinds of alloys.

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Magnetic moment of square SIS Josephson arrays: Self-organized criticality

Cited by 5 publications

References 29 publications

Statistical and Multifractal Properties of Barkhausen Jumps in Exchange-Coupled Antiferromagnetic/Ferromagnetic Bilayers

Statistical and Multifractal Properties of Barkhausen Jumps in Exchange-Coupled Antiferromagnetic/Ferromagnetic Bilayers

On the similarity of plastic flow processes during smooth and jerky flow: Statistical analysis

Role of superposition of dislocation avalanches in the statistics of acoustic emission during plastic deformation

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