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We present a survey of the structural and magnetic properties of submonolayertransition metal dioxides on the (001) surfaces of the heavy face-centeredcubic (fcc) noble metals Ir and Pt performed by spin-averaged scanningtunneling microscopy (STM) and spin-polarized (SP-)STM. Our STM results confirmthat deposition of Co, Fe, Mn, and Cr on the (2 {\times} 1)oxygen-reconstructed Ir(001) surface leads to the formation of quasione-dimensional chains with a (3 {\times} 1) unit cell. As recently predictedby density functional theory [Ferstl et al., Phys. Rev. Lett. 117, 046101(2016)], our SP-STM images of FeO2 and MnO2 on Ir(001) show a two-foldperiodicity along the chains which is characteristic for an antiferromagneticcoupling along the chains. In addition, these two materials also exhibitspontaneous, permanent, and long-range magnetic coupling across the chains.Whereas we find a ferromagnetic inter-chain coupling for FeO2/Ir(001), themagnetic coupling of MnO2 on Ir(001) appears to be a non-collinear 120{\deg}spin spiral, resulting in a (9 {\times} 2) magnetic unit cell. On Pt(001)patches of (3 {\times} 1)-reconstructed oxide chains could only be prepared bytransition metal (Co, Fe, and Mn) deposition onto the cold substrate andsubsequent annealing in an oxygen atmosphere. Again SP-STM on MnO2/Pt(001)reveals a very large, (15 {\times} 2) magnetic unit cell which can tentativelybe explained by a commensurate 72{\deg} spin spiral. Large scale SP-STM imagesreveal a long wavelength spin rotation along the MnO2 chain.

Structural and magnetic properties of 3d transition metal oxide chains on the (001) surfaces of Ir and Pt