  The determination of the interfacial Dzyaloshinskii-Moriya interaction for
perpendicularly magnetized thin layered films is not trivial and therefore
needs some experimental efforts to determine its sign and magnitude, especially
in the exchange biased system. Here, we developed a method proposed by D.-S.
Han et al. [Nano Lett. 16, (2016) 4438], which opens a way to investigate this
interaction using a conventional PMOKE magnetometer, also in exchange biased
systems. Using our approach we demonstrated that the Au/Co/NiO layered system
has a strong negative Dzyaloshinskii-Moriya interaction, which is independent
of the direction of perpendicular interlayer exchange bias coupling.
