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We studied the symmetry of magnetic properties and the resulting magnetictextures in ultra-thin epitaxial Au$_{0.67}$Pt$_{0.33}$/Co/W, a model systemexhibiting perpendicular magnetic anisotropy and interfaceDzyaloshinskii-Moriya interaction (DMI). As a peculiar feature, theC$_\mathrm{2v}$ crystal symmetry induced by the Co/W interface results in anadditional uniaxial in-plane magnetic anisotropy in the cobalt layer.Photoemission electron microscopy with magnetic sensitivity reveals theformation of self-organized magnetic stripe domains oriented parallel to thehard in-plane magnetization axis. We attribute this behavior to the lowerdomain wall energy when oriented along this axis, where both the DMI and thein-plane magnetic anisotropy favor a N\'{e}el domain wall configuration. Theanisotropic domain wall energy also leads to the formation of ellipticalskyrmion bubbles in a weak out-of-plane magnetic field.

Anisotropic skyrmion bubbles in ultra-thin epitaxial Au$_{0.67}$Pt$_{0.33}$/Co/W films