The Dendritic magnetic avalanches in carbon-free MgB$_2$ thin films with and without a deposited Au layer

Details The Dendritic magnetic avalanches in carbon-free MgB$_2$ thin films with and without a deposited Au layer The Dendritic magnetic avalanches in carbon-free MgB$_2$ thin films with and without a deposited Au layer

2005-04-07

arxiv.org/abs/cond-mat/0504156v1

Physics

Condensed Matter

Superconductivity

9 pages, 4 figeures

Scientific paper

10.1063/1.2084323

From the magneto optics images (MOI), the dendritic magnetic avalanche is known to appear dominantly for thin films of the newly discovered MgB$_2$. To clarify the origin of this phenomenon, we studied in detail the MOI of carbon-free MgB$_2$ thin films with and without a deposited gold layer. The MOI indicated carbon contamination was not the main source of the avalanche. The MOI clearly showed that the deposition of metallic gold deposition on top of a MgB$_2$ thin film improved its thermal stability and suppressed the sudden appearance of the dendritic flux avalanche. This is consistent with the previous observation of flux noise in the magnetization.

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