New Reversal Mode in Exchange Coupled Antiferromagnetic/Ferromagnetic Disks: Distorted Viscous Vortex

Dustin A. Gilbert, Li Ye, Aïda Varea, Sebastià Agramunt-Puig, Nuria Del Valle, Carles Navau, José Francisco López-Barbera, Kristen S. Buchanan, Axel Hoffmann, Alvar Sánchez, Jordi Sort, Kai Liu, Josep Nogués

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© The Royal Society of Chemistry. Magnetic vortices have generated intense interest in recent years due to their unique reversal mechanisms, fascinating topological properties, and exciting potential applications. In addition, the exchange coupling of magnetic vortices to antiferromagnets has also been shown to lead to a range of novel phenomena and functionalities. Here we report a new magnetization reversal mode of magnetic vortices in exchange coupled Ir<inf>20</inf>Mn<inf>80</inf>/Fe<inf>20</inf>Ni<inf>80</inf> microdots: distorted viscous vortex reversal. In contrast to the previously known or proposed reversal modes, the vortex is distorted close to the interface and viscously dragged due to the uncompensated spins of a thin antiferromagnet, which leads to unexpected asymmetries in the annihilation and nucleation fields. These results provide a deeper understanding of the physics of exchange coupled vortices and may also have important implications for applications involving exchange coupled nanostructures.
Idioma originalEnglish
Pàgines (de-a)9878-9885
RevistaNanoscale
Volum7
Número21
DOIs
Estat de la publicacióPublicada - 1 de gen. 2015

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