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Due to their exceptional topological and dynamical properties magneticskyrmions - localized stable spin structures on the nanometre scale - showgreat promise for future spintronic applications. To become technologicallycompetitive, isolated skyrmions with diameters below 10 nm that are stable atzero magnetic field and room temperature are desired. Despite finding skyrmionsin a wide spectrum of materials, the quest for a material with these envisionedproperties is still ongoing. Here we report zero field isolated skyrmions withdiameters smaller than 5 nm coexisting with 1 nm thin domain walls in Rh/Coatomic bilayers on the Ir(111) surface. These spin structures are characterizedby spin-polarized scanning tunnelling microscopy and can also be detected usingnon-spin-polarized tips due to a large non-collinear magnetoresistance. Wedemonstrate that sub-10 nm skyrmions are stabilised in these ferromagnetic Cofilms at zero field due to strong frustration of exchange interaction, togetherwith Dzyaloshinskii-Moriya interaction and a large magnetocrystallineanisotropy.

Isolated zero field sub-10 nm skyrmions in ultrathin Co films