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A magnetic vortex has attracted significant attention since it is atopologically stable magnetic structure in a soft magnetic nanodisk. Manystudies have been devoted to understanding the nature of magnetic vortex inisolated systems. Here we show a new aspect of a magnetic vortex the dynamicsof which strongly affects the magnetic structures of environment. We exploit ananodot of an exchange-coupled bilayer with a soft magnetic Ni81Fe19(permalloy; Py) having a magnetic vortex and a perpendicularly magnetizedL10-FePt exhibiting a large switching field (Hsw). The vortex dynamics withazimuthal spin waves makes the excess energy accumulate in the Py, whichtriggers the reversed-domain nucleation in the L10-FePt at a low magneticfield. Our results shed light on the non-local mechanism of a reversed-domainnucleation, and provide with a route for efficient Hsw reduction that is neededfor ultralow-power spintronic devices.

Vortex Dynamics-Mediated Low-Field Magnetization Switching in an Exchange-Coupled System