Kinetic roughening of magnetic flux penetration in MgB2 thin films

Authors

Andrea Lucarelli, College of William and Mary, USA
Stephanie Hummert, College of William and Mary, USA
Andrea Chaney, College of William and Mary, USA
Gunter Lupke, College of William and Mary, USA
Brian Moeckly, Superconductor Technologies, USA
Yue Zhao, University of WollongongFollow
S X. Dou, University of WollongongFollow

RIS ID

21675

Publication Details

Lucarelli, A, Hummert, S, Chaney, A, Lupke, G, Moeckly, B, Zhao, Y & Dou, SX (2007), Kinetic roughening of magnetic flux penetration in MgB2 thin films, Applied Physics Letters, 91(22), pp. 222505-1-222505-3.

Abstract

Time-resolved magneto-optical studies are performed on MgB₂ thin film samples grown by in situ pulsed laser deposition and in situ reactive deposition technique. The latter reveal dendritic avalanche-free flux penetration. The kinetic roughening of magnetic flux penetration is studied for applied ac current. Dynamic scaling laws determined for both static field and ac current are consistent with the directed percolation depinning model, placing the vortex dynamics in MgB₂ in the same universality class as YBCO and Nb.