Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques
MA 20.69: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Imaging of magnetisation dynamics of coupled vortices in trilayer systems — •Anja Banholzer1, Sebastian Wintz1, Christopher Bunce1, Thomas Strache1, Michael Körner1, Arthur Erbe1, Aleksandr Puzic2, Jörg Raabe2, Christoph Quitmann2, Kilian Lenz1, and Jürgen Fassbender1 — 1Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany — 2Paul Scherrer Institut, 5232 Villigen, Switzerland
Magnetic vortices recently gained interest as potential storage media. Different control methods are used to manipulate the vortex states. We now use scanning transmission x-ray microscopy (STXM) to image the magnetic configurations within the different layers of a Co/Cu/NiFe trilayer system. The dominant coupling mechanisms here are the magneto-dipolar interaction and interlayer exchange coupling. The corresponding magnetization configurations under a static magnetic field, as well as ac magnetic fields are investigated. The emerging motion of the core is tunable by the amplitude and frequency of the field. The interactions of the two cores and their individual resonance frequencies are studied. This implies a corresponding resistance change of different configurations at different magnetic fields and currents as well as the displacement of the core.