Understanding the emergence of Neel type skyrmions and bubbles in uniaxial centrosymmetric ferrimagnetic thin-film at room temperature

One of the major technological challenges is the development of novel memory technologies that allow fast and energy efficient reading and writing of information. Magnetic materials allow to solve this challenge by employing exotic and stable chiral and topological magnetic states such as spin spirals, skyrmions and bubbles. The Dzyaloshinskii-Moriya interaction (DMI) is often responsible for such topological magnetic states. DMI manifests traditionally at metallic ferromagnet/heavy-metal interfaces, owing to inversion symmetry breaking and spin-orbit coupling by a heavy metal. Our recent experimental observations suggest that Neel type skyrmions and bubbles can be induced even in rare-earth yttrium iron garnet (YIG) at room temperature through application of alternating magnetic fields. Here we propose to use resonant X-rays at forbidden reflections (where we are sensitive to the charge, magnetic and orbital ordering) to understand the underlying mechanism.