Hysteresis, avalanches, and noise

Hysteresis , Avalanches , and Noise

systems, especially when the time needed to implement the algorithm is included, the scaling of time and memory with system size becomes crucial for larger simulations. In our studies of hysteresis and avalanches in the zerotemperature random-field Ising model, a simple model of magnetism, we often have had to do very large simulations. Previous simulations were usually limited to relatively sm...

Hysteresis, Avalanches, and Barkhausen Noise

Avalanches, scaling, and coherent noise.

We present a simple model of a dynamical system driven by externallyimposed coherent noise. Although the system never becomes critical in the sense of possessing spatial correlations of arbitrarily long range, it does organize into a stationary state characterized by avalanches with a power-law size distribution. We explain the behavior of the model within a time-averaged approximation, and dis...

Hysteresis and avalanches in two-dimensional foam rheology simulations.

Foams have unique rheological properties that range from solidlike to fluidlike. We study two-dimensional noncoarsening foams of different disorder under shear in a Monte Carlo simulation, using a driven large-Q Potts model. Simulations of periodic shear on an ordered foam show several different response regimes. At small strain amplitudes, bubbles deform and recover their shapes elastically, a...

0 Hysteresis and Avalanches in the Random Anisotropy

The behaviour of the Random Anisotropy Ising model at T = 0 under local relaxation dynamics is studied. The model includes a dominant short-range ferromagnetic interaction and assumes an infinite anisotropy at each site along local anisotropy axes which are randomly aligned. As a consequence , some of the effective interactions become antiferromagnetic-like and frustration appears. Two differen...