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Two-dimensional (2D) magnet-superconductor hybrid systems are intensivelystudied due to their potential for the realization of 2D topologicalsuperconductors with Majorana edge modes. It is theoretically predicted thatthis quantum state is ubiquitous in spin-orbit coupled ferromagnetic orskyrmionic 2D spin-lattices in proximity to an s-wave superconductor. However,recent examples suggest that the requirements for topological superconductivityare complicated by the multi-orbital nature of the magnetic components anddisorder effects. Here, we investigate Fe monolayer islands grown on a surfaceof the s-wave superconductor with the largest gap of all elementalsuperconductors, Nb, with respect to magnetism and superconductivity usingspin-resolved scanning tunneling spectrosopy. We find three types of Femonolayer islands which differ by their reconstruction inducing disorder, themagnetism and the sub-gap electronic states. All three types are ferromagneticwith different coercive fields indicating diverse exchange and anisotropyenergies. On all three islands, there is finite spectral weight throughout thesubstrate's energy gap at the expense of the coherence peak intensity,indicating the formation of Shiba bands overlapping with the Fermi energy. Thegap filling and coherence peak reduction is strongest for the island withlargest coercive field. A strong lateral variation of the spectral weight ofthe Shiba bands signifies substantial disorder on the order of the substrate'spairing energy with a length scale of the period of the three differentreconstructions. There are neither signs of topological gaps within these bandsnor of any kind of edge modes. Our work illustrates that a reconstructed growthmode of magnetic layers on superconducting surfaces is detrimental for theformation of 2D topological superconductivity.

Correlation of Magnetism and Disordered Shiba Bands in Fe Monolayer Islands on Nb(110)