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Despite a decade of research, the precise mechanisms occurring at interfacesunderlying the Dzyaloshinskii-Moriya interaction (DMI), and thus thepossibility of fine-tuning it, are not yet fully identified. In this study, weinvestigate the origin of the interfacial DMI, aiming at disentangling howindependent are the interfaces around the ferromagnetic layer, and what aretheir relative contributions to the effective DMI amplitude. For this purpose,we have grown and investigated a large variety of systems with a commonstructure Pt$|$Co$|M$ with $M =$ Ni, Pd, Ru, Al, Al$|$Ta and MoSi. We explorethe correlation between the effective interfacial DMI, and different intrinsicproperties of metals, namely atomic number, electronegativity and work functiondifference at the Co$|M$ interfaces. We find a linear relationship betweeninterfacial DMI and the work function difference between the two elements,hence relating the nature of this behavior to the interfacial potentialgradient at the metallic interfaces. The understanding of the DMI mechanism isof utmost importance since it opens up the possibility of precisely engineeringthe magnetic and hence the spintronic properties for future devices.

Element-selective modulation of interfacial Dzyaloshinskii-Moriya interaction in Pt|Co|Metal based multilayers