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A broken interfacial inversion symmetry in ultrathin ferromagnet/heavy metal(FM/HM) bilayers is generally believed to be a prerequisite for accommodatingthe Dzyaloshinskii-Moriya interaction (DMI) and for stabilizing chiral spintextures. In these bilayers, the strength of the DMI decays as the thickness ofthe FM layer increases and vanishes around a few nanometers. In the presentstudy, through synthesizing relatively thick films of compositions CoPt orFePt, CoCu or FeCu, FeGd and FeNi, contributions to DMI from the compositiongradient induced bulk magnetic asymmetry (BMA) and spin-orbit coupling (SOC)are systematically examined. Using Brillouin light scattering spectroscopy,both the sign and amplitude of DMI in films with controllable direction andstrength of BMA, in the presence and absence of SOC are experimentally studied.In particular, we show that a sizable amplitude of DMI (0.15 mJ/m^2) can berealized in CoPt or FePt films with BMA and strong SOC, whereas negligible DMIstrengths are observed in other thick films with BMA but without significantSOC. The pivotal roles of BMA and SOC are further examined based on thethree-site Fert-Levy model and first-principles calculations. It is expectedthat our findings may help to further understand the origin of chiral magnetismand to design novel non-collinear spin textures.

Quantifying the Dzyaloshinskii-Moriya Interaction Induced by the Bulk Magnetic Asymmetry