Microscopic Study of Dendritic Avalanches in MgB2 Thin Films of Various Widths
SCIE
SCOPUS
- Title
- Microscopic Study of Dendritic Avalanches in MgB2 Thin Films of Various Widths
- Authors
- Lee, JY; Lee, HS; Lee, HJ; Choi, EM; Kang, WN; Lee, SI
- Date Issued
- 2010-04
- Publisher
- The Physcical Society of Japan
- Abstract
- To understand the features of a dendritic avalanche, we prepared the eight sets of MgB2 thin films with rectangular shapes of 3 mm [length L] x w [width], where w = 0.2 to 1.6 mm; the samples were in the long-length limit of w < L. Magneto-optical images (MOIs) of the first few dendrite patterns, which were distributed sparsely, were taken at applied fields below 35 mT at a temperature of 4 K. The key features of the present measurements are as follows: (1) the number of branches and the area of the dendrites increase with increasing w; (2) the change in the flux density (CFD) from before to after the jump at the edge of the samples increased with increasing w; (3) the applied magnetic flux density of the first few appearances of dendrites decreased with increasing of the w; (4) the real initial penetration flux density at the sample's edge was about 20 mT, regardless of w; (5) the critical current densities obtained from the MOI were almost the same for all samples, which implies that Bean's critical model works quite well.
- Keywords
- MgB2 thin film; flux jump; demannetization effect; INSTABILITY
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26219
- DOI
- 10.1143/JPSJ.79.044712
- ISSN
- 0031-9015
- Article Type
- Article
- Citation
- JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, vol. 79, no. 4, page. 44712-1 - 44712-4, 2010-04
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.