Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.4: Poster
Tuesday, March 13, 2018, 09:30–13:00, Poster A
Spin wave dynamics in the chiral magnet Fe50Ge50 — •Nicolas Josten1, Benjamin Zingsem1,2, Detlef Spoddig1, Iliya Radulov3, Ralf Meckenstock1, Thomas Feggeler1, Michael Farle1, and Oliver Gutfleisch3 — 1Faculty of Physics and Center for Nanointegration (CENIDE), University Duisburg Essen, Duisburg, 47057, Germany — 2Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 3Department of Material- and Geosciences, Functional Materials, Technische Universität Darmstadt
We use X-band ferromagnetic resonance (FMR) spectroscopy inside an R-Type micro-resonator [1] to investigate polycrystalline micron sized samples of Fe50Ge50, a chiral magnet, with a B20 crystal structure. Unusual dynamics in confined chiral magnets were, for example, predicted in [2], showing that additional resonance modes are expected in confined chiral systems as opposed to achiral systems. Indeed, besides the uniform main mode, we observe a multitude of resonances at high fields (200-900 mT), identified as spin wave modes, which cannot be explained within the standard model of FMR and are tailorable in wedge-shaped samples due to the special geometric boundary conditions. Furthermore, we find a unidirectional anisotropy for the spin waves, which does not affect the uniform main mode.
[1] R. Narkowicz, D. Suter, and I. Niemeyer. Rev. of Sci. Instr., 79(8):084702, 2008. [2] B. Zingsem, M. Farle, R. Stamps, R. Camley. arXiv:1609.03417