Ultrathin magnetic films on heavy metal substrates with strong spin-orbit coupling provide versatile platforms for exploring novel spin textures. So far, structurally open fcc(110) substrates remain largely unexplored. Here, we stabilize a metastable, unreconstructed Ir(110)-$(1\times 1)$ surface on which Fe forms a stable pseudomorphic double layer. Combining spin-polarized scanning tunneling microscopy and ab initio calculations, we reveal a right-handed Néel-type spin spiral along the $\left[\overline{1}10\right]$ crystallographic direction with a period of 1.27 nm as the magnetic ground state. Our analysis reveals this spiral is of the Yoshimori type, i.e., driven by frustrated Heisenberg interactions, with the Dzyaloshinskii-Moriya interaction determining its cycloidal nature and handedness.

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• Dzyaloshinskii-Moriya interaction
• Exchange interaction
• Magnetism
• Spin texture
• Magnetic thin films
• Noncollinear magnets
• Density functional theory
• Spin-polarized scanning tunneling microscopy