Berlin 2012 – scientific programme
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DS: Fachverband Dünne Schichten
DS 19: Poster I: Multiferroics (jointly with MA, DF, KR, TT), Spins in organic materials (jointly with MA), FePt Nanoparticles (jointly with MA, MM)
DS 19.51: Poster
Tuesday, March 27, 2012, 12:15–15:15, Poster A
Pairs of diverging-converging spin vortices in biquadratically interlayer exchange coupled elements — •Sebastian Wintz1, Christopher Bunce1, Anja Banholzer1, Thomas Strache1, Michael Körner1, Sibylle Gemming1, Artur Erbe1, Jeffrey McCord2, Jörg Raabe3, Christoph Quitmann3, and Jürgen Fassbender1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Christian-Albrechts-Universität zu Kiel, Kiel, Germany — 3Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland
Spin structures have been a relevant topic of magnetism research for many years. In particular, magnetic vortices have attracted much attention, due to their non-trivial topology and the various dynamic modes they exhibit [1]. A magnetic vortex consists of a planar, flux-closing magnetization curl that turns out of the plane in the central nanoscopic core. For a single layer structure, the curl’s radial components typically cancel each other out. Recent investigations show that this holds also true for multilayer vortex systems comprising bilinear interlayer exchange coupling (IEC) [2]. In this contribution we report on pairs of diverging-converging spin vortices occurring in biquadratically coupled systems. Using magnetic x-ray microscopy we directly observe that the individual vortices of such pairs possess a residual radial magnetization component. From this ∇ Mxy ≠ 0, an additional perpendicular magnetization divergence ∇ Mz is analytically deduced. We compare our continuous model with discrete micromagnetic simulations. [1] S.-B. Choe et al., Science 304, 420 (2004). [2] S. Wintz et al., Appl. Phys. Lett. 98, 232511 (2011).