Abstract
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, thetemperature for the occurrence of flux avalanches is shifted to lower temperaturesTa as observed by MO studies. On the other hand, magnetic hysteresis loops (MHLs)obtained by SQUID measurements show a significant asymmetry with respect to theHext = 0 axis attributed to magnetic effects on flux line pinning. Interestingly, theposition of the central peak of the MHLs is shifted to positive fieldsHcp.
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