Coupled vortex oscillations in spatially separated permalloy squares |
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Authors: | Vogel Andreas Kamionka Thomas Martens Michael Drews André Chou Kang Wei Tyliszczak Tolek Stoll Hermann Van Waeyenberge Bartel Meier Guido |
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Affiliation: | Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universit?t Hamburg, 20355 Hamburg, Germany. andreas.vogel@physnet.uni-hamburg.de |
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Abstract: | We experimentally study the magnetization dynamics of pairs of micron-sized permalloy squares coupled via their stray fields. The trajectories of the vortex cores in the Landau-domain patterns of the squares are mapped in real space using time-resolved scanning transmission x-ray microscopy. After excitation of one of the vortex cores with a short magnetic-field pulse, the system behaves like coupled harmonic oscillators. The coupling strength depends on the separation between the squares and the configuration of the vortex-core polarizations. Considering the excitation via a rotating in-plane magnetic field, it can be understood that only a weak response of the second vortex core is observed for equal core polarizations. |
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