Single monolayer ferromagnetic perovskite SrRuO3 with high conductivity and strong ferromagnetism

Achieving robust ferromagnetism and high conductivity in atomically thin oxide materials is critical for advancing spintronic technologies. Here, we report the growth of a highly conductive and ferromagnetic single monolayer SrRuO3 having a high Curie temperature of 154 K on DyScO3 110 substrates. The SrTiO3 capping layer effectively suppresses surface reactions, which typically hinder ferromagnetism in atomically thin films. X ray absorption spectroscopy and X ray magnetic circular dichroism measurements revealed strong orbital hybridization between Ru 4d and O 2p orbitals in the SRO monolayer, which contributes to enhancement of the conductivity and ferromagnetic ordering of both the Ru 4d and O 2p orbitals. The resistivity of the single monolayer SrRuO3 on the better lattice matched DyScO3 substrate is approximately one-third of that of previously reported single monolayer SrRuO3 grown on an SrTiO3 substrate. This study highlights the potential of monolayer SrRuO3 as a platform for two dimensional magnetic oxide systems, offering new opportunities for the eploration of spintronic devices and quantum transport phenomena.