Transverse instabilities of multiple vortex chains in superconductor-ferromagnet bilayers

Abstract

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.

accepted in PRB-Rapids

References in corpus (3)

• Two Dimensional Atomic Crystals
• Guiding superconducting vortices by magnetic domain walls
• Long-range nonlocal flow of vortices in narrow superconducting channels

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