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Vortex Avalanche in Gold-Coated and Finite-Sized MgB2 Thin Films
최은미,이성익,{AA}. A. F. Olsen,D. V. Shantsev,Hyun-Sook Lee,T. H. Johansen 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
The vortex avalanches in carbon-free MgB2 thin films were studied using magneto-optical imaging. The main focus of this study was the effect of a gold coating and the sample size on the occurrence of dendritic flux avalanches. For this purpose, we prepared two different sets of MgB2 films. In the first, the films had gold coatings of various thickness, and in the second set bare MgB2 films were patterned into long strips of different widths. The dendritic flux avalanches essentially disappeared for gold coatings thicker than 2.5 μm. Also, for strip widths less than 0.3 × 3 mm2, the formation of flux dendrites were suppressed. The results are consistent with a thermomagnetic origin of the dendritic instability.