The critical Barkhausen avalanches in thin random-field ferromagnets with an open boundary.

ABSTRACT: The interplay between the critical fluctuations and the sample geometry is investigated numerically using thin random-field ferromagnets exhibiting the field-driven magnetisation reversal on the hysteresis loop. The system is studied along the theoretical critical line in the plane of random-field disorder and thickness. The thickness is varied to consider samples of various geometry between a two-dimensional plane and a complete three-dimensional lattice with an open boundary in the direction of the growing thickness. We perform a multi-fractal analysis of the Barkhausen noise signals and scaling of the critical avalanches of the domain wall motion. Our results reveal that, for sufficiently small thickness, the sample geometry profoundly affects the dynamics by modifying the spectral segm

SUBMITTER: Tadic B 

PROVIDER: S-EPMC6474887 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature