Temperature Dependence of the Flux Jump Upper Threshold Field in MgB2 Thin Films
SCIE
SCOPUS
- Title
- Temperature Dependence of the Flux Jump Upper Threshold Field in MgB2 Thin Films
- Authors
- Lee, JY; Choi, EM; Lee, HS; Cho, MH; Olsen, AAF; Johansen, TH; Oh, YS; Kim, KH; Han, YH; Sung, TH; Lee, SI
- Date Issued
- 2008-10
- Publisher
- PHYSICAL SOC JAPAN
- Abstract
- The origin of the magnetic flux noise in MgB2 thin films is believed to be a thermo-magnetic instability, where the local dissipation created by vortex motion leads to reduced pinning, and forms a positive feedback loop which can develop into a thermo-magnetic runaway. However, only the lower threshold field (H-l) for the appearance of this noise was investigated by the magneto-optics (MO) technique due to the field limit of the MO indicator. In this paper, we report the upper threshold field, (H-u) which is successfully obtained by different technique using a vibrating sample magnetometer while varying temperature and the field interval. After the analysis of magnetic hysteresis curves, we found that H-u is strongly depends on sample geometry and temperature. This is consistent with the phenomenological model mentioned above.
- Keywords
- MgB2; thin film; flux jump; width dependence; CRITICAL-CURRENT DENSITY; INSTABILITY; GROWTH
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22440
- DOI
- 10.1143/JPSJ.77.1047
- ISSN
- 0031-9015
- Article Type
- Article
- Citation
- JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, vol. 77, no. 10, page. 104717 - 104717, 2008-10
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