Stefano Zapperi and Gianfranco Durin studied the statistics of Barkhausen effect avalanches in soft ferromagnets. Slowly changing the applied magnetic field produces bursts of magnetization as pinned domain walls move. Their 2000 work measured avalanche-size distributions in polycrystalline and amorphous materials and found distinct scaling classes in the slow-drive limit. Interpreting the data through the release of pinned domain walls connects irregular magnetic noise with a collective phase transition, including a quantitative relation between the distribution cutoff and the demagnetizing factor.[ref]
Scaling exponents for Barkhausen avalanches in polycrystals and amorphous ferromagnets by Gianfranco Durin and Stefano Zapperi. abstract: measured exponents, slow-drive limit and domain-wall interpretation
A physicist and professor of theoretical physics of matter at Milan.[ref]
Stefano Zapperi: university profile. Description, Professional positions: professor of theoretical physics of matter, University of Milan, from 2015
Portrait of Stefano Zapperi
. Francesc Font Clos (explicit caption credit on the official FAU article). External portrait hosted by Friedrich-Alexander-Universität Erlangen-Nürnberg. Source. New to topics? Read the docs here!