Skyrmion Spin Structure of Exchange-Coupled Magnetic Core–Shell Nanodisk

We study the skyrmion spin texture created in a cylindrical exchange-coupled magnetic core-shell nanodisk (Co/CoPt) in the absence of the Dzyaloshinskii-Moriya interaction. The evolution of the skyrmion spin texture under varying applied field is investigated. The skyrmion core size can be tuned by an external magnetic field. However, skyrmion spin texture will be destroyed for a large enough applied field. With the stability and controllability of magnetic states, the exchange-coupled magnetic core-shell nanodisk can make a high potential for future storage media and devices, with the storage of data in the form of skyrmions.