A new reversal mode in exchange coupled antiferromagnetic/ferromagnetic disks: distorted viscous vortex. Issue 21 (12th May 2015)

• Record Type: Journal Article
• Authors: Gilbert, Dustin A.; Ye, Li; Varea, Aïda; Agramunt-Puig, Sebastià; del Valle, Nuria; Navau, Carles; López-Barbera, José Francisco; Buchanan, Kristen S.; Hoffmann, Axel; Sánchez, Alvar; Sort, Jordi; Liu, Kai; Nogués, Josep
• Is Part Of: Nanoscale. Volume 7:Issue 21(2015)
• Page Start: 9878
• Page End: 9885
• Publication Date: 2015-05-12
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr01856k
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Ferromagnetic dots coupled to a thin antiferromagnet reverse via a distorted viscous vortex state. Abstract : 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 Ir20 Mn80 /Fe20 Ni80 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.