Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Magnetization and Demagnetization Dynamics I
MA 16.4: Vortrag
Dienstag, 8. März 2016, 10:15–10:30, H34
Thermally Tunable Coupled Magnetic Vortex Oscillators — •Michael Vogel1, Johannes Wild1, Bernhard Zimmermann1, Michael Müller1, Claudia K.A. Mewes2, Tim Mewes2, Josef Zweck1, and Christian. H. Back1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Regensburg, Germany — 2MINT Center / Depeartment of Physics and Astronomy, University of Alabama, Tuscaloosa, AL, USA
Recently, the magnetization dynamics in neighboring magnetic vortex oscillators coupled via their stray fields came into focus of research [K. Yu. Guslienko, V. Novosad, Y. Otani, H. Shima, and K. Fukamichi, Phys. Rev. B 65, 024414 (2001)]. The system behaves like damped coupled harmonic oscillators. It has been shown that the dynamics of such systems is strongly influenced by the strength of the magnetostatic interaction given by the distance between the elements and the relative configuration of the core polarizations, i.e., the directions of the out-of-plane magnetization components [A. Vogel, A. Drews, T. Kamionka, M. Bolte, and G. Meier, Phys. Rev. Lett. 105, 037201 (2010)]. The control of the coupling in such an array of magnetic discs is essential to implement logic operations. Here we present a novel technique to control the interaction of two or more vortex oscillators by directly influencing their resonance frequencies harnessing their temperature dependency.