Transverse instabilities of multiple vortex chains in superconductor-ferromagnet bilayers

Details Transverse instabilities of multiple vortex chains in superconductor-ferromagnet bilayers Transverse instabilities of multiple vortex chains in superconductor-ferromagnet bilayers

2009-10-16

arxiv.org/abs/0910.3030v1

Physics

Condensed Matter

Superconductivity

accepted in PRB-Rapids

Scientific paper

Using scanning tunneling microscopy and Ginzburg-Landau simulations we explore vortex configurations in magnetically coupled NbSe$_2$-Permalloy superconductor-ferromagnet bilayer. The Permalloy film with stripe domain structure induces periodic local magnetic induction in the superconductor creating a series of pinning-antipinning channels for externally added magnetic flux quanta. Such laterally confined Abrikosov vortices form quasi-1D arrays (chains). The transitions between multichain states occur through propagation of kinks at the intermediate fields. At high fields we show that the system becomes non-linear due to a change in both the number of vortices and the confining potential. The longitudinal instabilities of the resulting vortex structures lead to vortices `levitating' in the anti-pinning channels.

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