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Collective modes in three-dimensional magnonic vortex crystals

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Weigand,  Markus
Dept. Modern Magnetic Systems, Max Planck Institute for Intelligent Systems, Max Planck Society;

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Meier,  Guido
Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, 20355 Hamburg, Germany;
Dynamics and Transport in Nanostructures, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Ultrafast Electronics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany;

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srep22402.pdf
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Citation

Hänze, M., Adolff, C. F., Schulte, B., Möller, J., Weigand, M., & Meier, G. (2016). Collective modes in three-dimensional magnonic vortex crystals. Scientific Reports, 6: 22402. doi:10.1038/srep22402.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-CFD8-A
Abstract
Collective modes in three-dimensional crystals of stacked permalloy disks with magnetic vortices are investigated by ferromagnetic resonance spectroscopy and scanning transmission X-ray microscopy. The size of the arrangements is increased step by step to identify the different contributions to the interaction between the vortices. These contributions are the key requirement to understand complex dynamics of three dimensional vortex crystals. Both vertical and horizontal coupling determine the collective modes. In-plane dipoles strongly influence the interaction between the disks in the stacks and lead to polarity-dependent resonance frequencies. Weaker contributions discern arrangements with different polarities and circularities that result from the lateral coupling of the stacks and the interaction of the core regions inside a stack. All three contributions are identified in the experiments and are explained in a rigid particle model.