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Magneto-optical imaging was used to observe flux dendrites with oppositepolarities simultaneously penetrate superconducting, ring-shaped MgB$_2$ films.By applying a perpendicular magnetic field, branching dendritic structuresnucleate at the outer edge and abruptly propagate deep into the rings. Whenthese structures reach close to the inner edge, where flux with oppositepolarity has penetrated the superconductor, they occasionally trigger anti-fluxdendrites. These anti-dendrites do not branch, but instead trace the triggeringdendrite in the backward direction. Two trigger mechanisms, a non-localmagnetic and a local thermal, are considered as possible explanations for thisunexpected behaviour. Increasing the applied field further, the rings areperforated by dendrites which carry flux to the center hole. Repeatedperforations lead to a reversed field profile and new features of dendriteactivity when the applied field is subsequently reduced.Comment: 6 pages, 6 figures, accepted to Phys. Rev.

physical review. b, condensed matter and materials physics

Flux dendrites of opposite polarity in superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>rings observed with magneto-optical imaging

Flux dendrites of opposite polarity in superconductingMgB2rings observed with magneto-optical imaging