Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 22, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/22/4/045007
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A heterostructure of MgB2 and cobalt was investigated using SQUID magnetometry and magneto-optical (MO) imaging. Two different effects are observed. On the one hand, the temperature for the occurrence of flux avalanches is shifted to lower temperatures T-a as observed by MO studies. On the other hand, magnetic hysteresis loops (MHLs) obtained by SQUID measurements show a significant asymmetry with respect to the H-ext = 0 axis attributed to magnetic effects on flux line pinning. Interestingly, the position of the central peak of the MHLs is shifted to positive fields H-cp.
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