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  • PACS. 77.80.Dj Domain structure; hysteresis – 77.80.Fm Switching phenomena – 05.40.Ca Noise  (1)
  • PACS. 81.05.Rm Porous materials; granular materials[:AND:] 64.60.Lx Self-organized criticality; avalanche effect - 02.60.Cb Numerical simulation; solution of equations  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Switching current noise and relaxation of ferroelectric domains (2002)
    Springer
    The European physical journal 28 (2002), S. 81-89 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 77.80.Dj Domain structure; hysteresis – 77.80.Fm Switching phenomena – 05.40.Ca Noise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We simulate field-induced nucleation and switching of domains in a three-dimensional model of ferroelectrics with quenched disorder and varying domain sizes. We study (1) bursts of the switching current at slow driving along the hysteresis loop (electrical Barkhausen noise) and (2) the polarization reversal when a strong electric field was applied and back-switching after the field was removed. We show how these processes are related to the underlying structure of domain walls, which in turn is controlled by the pinning at quenched local electric fields. When the depolarization fields of bound charges are properly screened we find that the fractal switching current noise may appear with two distinct universal behaviors. The critical depinning of plane domain walls determines the universality class in the case of weak random fields, whereas for large randomness the massive nucleation of domains in the bulk leads to different scaling properties. In both cases the scaling exponents decay logarithmically when the driving frequency is increased. The polarization reverses in the applied field as a power-law, while its relaxation in zero field is a stretch exponential function of time. The stretching exponent depends on the strength of pinning. The results may be applicable for uniaxial relaxor ferroelectrics, such as doped SBN:Ce.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00203-1
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  • 2
    Electronic Resource
    Electronic Resource
    Time distribution and loss of scaling in granular flow (1999)
    Springer
    The European physical journal 7 (1999), S. 619-625 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 81.05.Rm Porous materials; granular materials[:AND:] 64.60.Lx Self-organized criticality; avalanche effect - 02.60.Cb Numerical simulation; solution of equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Two cellular automata models with directed mass flow and internal time scales are studied by numerical simulations. Relaxation rules are a combination of probabilistic critical height (probability of toppling p) and deterministic critical slope processes with internal correlation time tc equal to the avalanche lifetime, in model A, and ,in model B. In both cases nonuniversal scaling properties of avalanche distributions are found for , where is related to directed percolation threshold in d=3. Distributions of avalanche durations for are studied in detail, exhibiting multifractal scaling behavior in model A, and finite size scaling behavior in model B, and scaling exponents are determined as a function of p. At a phase transition to noncritical steady state occurs. Due to difference in the relaxation mechanisms, avalanche statistics at approaches the parity conserving universality class in model A, and the mean-field universality class in model B. We also estimate roughness exponent at the transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050654
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