Mapping flux avalanches in MgB2films—equivalence between magneto-optical imaging and magnetic measurements
| Autor: | Eun-Mi Choi, F. Colauto, Jae-Yeap Lee, Sung Ik Lee, W.A. Ortiz, Tom H. Johansen, V. V. Yurchenko |
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| Rok vydání: | 2007 |
| Předmět: |
Superconductivity
Physics Range (particle radiation) Magnetic measurements Materials science Condensed matter physics Magnetometer Metals and Alloys Flux Thermomagnetic convection Condensed Matter Physics Instability law.invention Vortex Magnetic field Magneto optical law Condensed Matter::Superconductivity Materials Chemistry Ceramics and Composites Electrical and Electronic Engineering Equivalence (measure theory) |
| Zdroj: | Superconductor Science and Technology. 20:L48-L50 |
| ISSN: | 1361-6668 0953-2048 |
| DOI: | 10.1088/0953-2048/20/8/l02 |
| Popis: | Vortex avalanches are known to occur in MgB2 films within a certain range of temperatures and magnetic fields. These events, resulting from a thermomagnetic instability, were first revealed by real-time magneto-optical imaging, which exposed dendritic paths of abrupt flux propagation. This very powerful technique has, however, a practical limitation, since sensors that are currently available cannot be used at high magnetic fields. This letter shows that results obtained using dc magnetometry are in good correspondence with those furnished by magneto-optical imaging, demonstrating that the two techniques can be efficiently used as complementary tools to map vortex avalanches in superconducting films. |
| Databáze: | OpenAIRE |
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