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An enhancement of the spin-orbit effects arising on an interface between aferromagnet (FM) and a heavy metal (HM) is possible through the strong breakingof the structural inversion symmetry in the layered films. Here we show thatthe introduction of an ultrathin W interlayer between Co and Ru in Ru/Co/Rufilms enables to preserve perpendicular magnetic anisotropy (PMA) andsimultaneously induce a large interfacial Dzyaloshinskii-Moriya interaction(iDMI). We find that the Ru/Co/W/Ru films have PMA up to 0.35 nm of the nominalthickness of W (tW). The study of the spin-wave propagation in theDamon-Eshbach geometry by Brillouin light scattering (BLS) spectroscopy revealsthe drastic increase of the iDMI value with the rising tW. The maximum iDMI of-3.1 erg/cm2 is observed for tW=0.24 nm, which is 10 times larger than thelatter for the quasi-symmetrical Ru/Co/Ru films. The ability to simultaneouscontrol the strength of PMA and iDMI in symmetrical HM/FM/HM trilayer systemsthrough the interface engineered inversion asymmetry at the nanoscale excitesnew fundamental and practical interest to the chiral ferromagnets, which are apotential host for magnetic skyrmions.

Nanoscale control of perpendicular magnetic anisotropy, interfacial  Dzyaloshinskii-Moriya interaction and skyrmions in the  inversion-symmetry-broken Ru/Co/W/Ru films