Interfacial potential gradient modulates Dzyaloshinskii-Moriya interaction in Pt/Co/metal multilayers

The actual mechanisms occurring at interfaces underlying the Dzyaloshinskii-Moriya interaction (DMI) remain a question in nanomagnetism. In this study, we investigate origin of interfacial DMI, aiming estimating how independent DMI contributions two FM layer are and what their relative weight effective amplitude is. To aim, explore correlation between metal properties, namely, atomic number, electronegativity, work function $M$. A clear linear relationship is found difference $\mathrm{Co}/M$ interface. This result strong evidence for chosen Co thickness(1 nm). It also suggests that $\mathrm{Co}/\mathrm{Cu}$ interface bears no DMI. These findings can guide optimization magnetic properties future devices.