Edge Contamination, Bulk Disorder, Flux Front Roughening, and Multiscaling in Type II Superconducting Thin Films

Michel Geahel (1, 2) , Isabelle Jouanny (3) , Dominique Gorse-Pomonti (3) , Marie Poirier-Quinot (3) , Javier Briatico (1) , Cornelis Jacominus van Der Beek (3)

1 Laboratoire Albert Fert (ex-UMPhy Unité mixte de physique CNRS/Thales)
2 IR4M - Imagerie par Résonance Magnétique Médicale et Multi-Modalités
3 LSI - Laboratoire des Solides Irradiés - Irradiated Solids Laboratory

We have investigated the effect of different types of disorder on the propagation, roughness, and scaling properties of magnetic flux fronts in a type II superconductor. A progression from the usual (Kardar-Parisi-Zhang-type) scaling to multiscaling is observed as the disorder strength is increased. A hierarchy of disorder strengths is established for YBa 2 Cu 3 O 7 d thin films. The results cast light on the physical origin of the roughening of flux fronts, and they are of interest for the design and elimination of flux noise in microscopic superconducting thin-film devices.

Mots clés: irradiation; roughening of elastic manifolds; type II superconductivity; vortex matter; flux pinning; critical current density; flux penetration; critical state; disorder; nonlinear diffusion

Domaines: Ingénierie biomédicale; Imagerie

Michel Geahel, Isabelle Jouanny, Dominique Gorse-Pomonti, Marie Poirier-Quinot, Javier Briatico, et al.. Edge Contamination, Bulk Disorder, Flux Front Roughening, and Multiscaling in Type II Superconducting Thin Films. Condensed Matter, 2017, 2 (3), pp.27. ⟨10.3390/condmat2030027⟩. ⟨hal-02269996⟩