Sub-100 nm Skyrmions at Zero Magnetic Field in Ir/Fe/Co/Pt Nanostructures

摘要: Magnetic skyrmions are chiral spin structures that have recently been observed at room temperature (RT) in multilayer thin films. Their topological stability should enable high scalability confined geometries - a sought-after attribute for device applications. While umpteen theoretical predictions made regarding the phenomenology of sub-100 nm dots, practice their formation absence an external magnetic field and evolution with confinement remain to be established. Here we demonstrate confinement-induced stabilization RT zero (ZF) Ir/Fe(x)/Co(y)/Pt nanodots over wide range geometric parameters. The ZF skyrmion size can as small ~50 nm, varies by factor 4 dot Crucially, varying thermodynamic exhibit markedly different phenomenologies. These results establish comprehensive foundation nanostructures, provide immediate directions exploiting properties nanoscale devices.