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

Authors
  • Choi, Eun-Mi
  • Lee, Hyun-Sook
  • Kim, Hyun Jung
  • Kang, Byeongwon
  • Lee, Sung-Ik
  • Olsen, A. A. F.
  • Shantsev, D. V.
  • Johansen, T. H.
Type
Preprint
Publication Date
Apr 07, 2005
Submission Date
Apr 07, 2005
Identifiers
DOI: 10.1063/1.2084323
arXiv ID: cond-mat/0504156
Source
arXiv
License
Unknown
External links

Abstract

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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