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To stabilize the non-trivial spin textures, e.g., skyrmions or chiral domainwalls in ultrathin magnetic films, an additional degree of freedom such as theinterfacial Dzyaloshinskii-Moriya interaction (IDMI) must be induced by thestrong spin-orbit coupling (SOC) of a stacked heavy metal layer. However,advanced approaches to simultaneously control IDMI and perpendicular magneticanisotropy (PMA) are needed for future spin-orbitronic device implementations.Here, we show an effect of atomic-scale surface modulation on the magneticproperties and IDMI in ultrathin films composed of 5d heavymetal/ferromagnet/4d(5d) heavy metal or oxide interfaces, such asPt/CoFeSiB/Ru, Pt/CoFeSiB/Ta, and Pt/CoFeSiB/MgO. The maximum IDMI valuecorresponds to the correlated roughness of the bottom and top interfaces of theferromagnetic layer. The proposed approach for significant enhancement of PMAand IDMI through the interface roughness engineering at the atomic scale offersa powerful tool for the development of the spin-orbitronic devices with theprecise and reliable controllability of their functionality.

npg asia materials

Enhancement of perpendicular magnetic anisotropy and  Dzyaloshinskii-Moriya interaction in thin ferromagnetic films by atomic-scale  modulation of interfaces