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Ambient magnetic skyrmions stabilized in multilayer nanostructures are ofimmense interest due to their relevance to magnetic tunnel junction (MTJ)devices for memory and unconventional computing applications. However, existingskyrmionic nanostructures built using conventional metallic or oxide multilayernanodots are unable to concurrently fulfill the requirements of nanoscaleskyrmion stability and feasibility of all-electrical readout and manipulation.Here, we develop a few-repeat hybrid multilayer platform consisting of metallic[Pt/CoB/Ir]3 and oxide [Pt/CoB/MgO] components that are coupled to evolvetogether as a single, composite stack. Zero-field (ZF) skyrmions with sizes assmall as 50 nm are stabilized in the hybrid multilayer nanodots, which aresmoothly modulated by up to 2.5x by varying CoB thickness and dot sizes.Meanwhile, skyrmion multiplets are also stabilized by small bias fields.Crucially, we observe higher order 'target' skyrmions with varyingmagnetization rotations in moderately-sized, low anisotropy nanodots. Theseresults provide a viable route to realize long-sought skyrmionic MTJ devicesand new possibilities for multi-state skyrmionic device concepts.

Stability and Character of Zero Field Skyrmionic States in Hybrid Magnetic Multilayer Nanodots