= Stefano Zapperi
{c}
{tag=Physicist}
= S. Zapperi
{c}
{synonym}
<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.<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]{ref}
A <physicist> and professor of theoretical physics of matter at Milan.<Stefano Zapperi: university profile>[Description, Professional positions: professor of theoretical physics of matter, University of Milan, from 2015]{ref}
\Image[https://www.fau.de/wp-content/uploads/sites/4/2019/10/stefano-zapperi2019b-899x1024.jpg]
{title=Portrait of <Stefano Zapperi>}
{description=Francesc Font Clos (explicit caption credit on the official FAU article). External portrait hosted by Friedrich-Alexander-Universität Erlangen-Nürnberg.}
{source=https://www.fau.de/2019/10/news/universitaet/leute/prof-dr-stefano-zapperi/}
{width=260}
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