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We report on a direct measurement of sizable interfacialDzyaloshinskii-Moriya interaction (iDMI) at the interface of two-dimensionaltransition metal dichalcogenide (2D-TMD), MoS$_{\rm 2}$ and Ni$_{80}$Fe$_{20}$(Py) using Brillouin light scattering spectroscopy. A clear asymmetry inspin-wave dispersion is measured in MoS$_{\rm 2}$/Py/Ta, while no suchasymmetry is detected in the reference Py/Ta system. A linear scaling of theDMI constant with the inverse of Py thickness indicates the interfacial originof the observed DMI. We further observe an enhancement of DMI constant in threeto four layer MoS$_{\rm 2}$/Py system (by 56$\%$) as compared to 2 layerMoS$_{\rm 2}$/Py which is caused by a higher density of MoO$_{\rm 3}$ defectspecies in the case of three to four layer MoS$_{\rm 2}$. The results openpossibilities of spin-orbitronic applications utilizing the 2D-TMD basedheterostructures.

Direct measurement of interfacial Dzyaloshinskii-Moriya interaction at the MoS$_{\rm 2}$/Ni$_{80}$Fe$_{20}$ interface