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Pré-Publication, Document De Travail Année : 2021

Force-Force Correlations in Disordered Magnets

Kay Joerg Wiese
Cathelijne ter Burg
  • Fonction : Auteur
Gianfranco Durin
  • Fonction : Auteur
Felipe Bohn
  • Fonction : Auteur

Résumé

We study experimentally the force-force correlator in Barkhausen experiments. We observe two distinct universality classes, depending on the range of spin interactions. For short-ranged elasticity, we find the universal correlator predicted by the functional renormalization group in $d=2$. For long-ranged elasticity we observe its 1-loop solution. In all cases force-force correlations grow linearly at small distances, as is assumed in the ABBM model, but in contrast to the latter are bounded at large distances. As a consequence, avalanches are anti-correlated, i.e. reduced in size, at short distances.

Dates et versions

hal-03358831 , version 1 (29-09-2021)

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Kay Joerg Wiese, Cathelijne ter Burg, Gianfranco Durin, Felipe Bohn, Ruben L. Sommer. Force-Force Correlations in Disordered Magnets. 2021. ⟨hal-03358831⟩
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