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Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Magnonics I

MA 45.4: Vortrag

Donnerstag, 19. März 2020, 10:15–10:30, HSZ 401

Dynamic Unidirectional Magnetic Anisotropy due to Chiral Magnetic Coupling — •Nicolas Josten1, Benjamin Zingsem1, Thomas Feggeler1, Ralf Meckenstock1, Detlef Spoddig1, Marina Spasova1, Ke Chai2, Iliya Radulov3, Zi-An Li2, Oliver Gutfleisch3, and Michael Farle11Faculty of Physics and Center for Nanointegration (CENIDE), University Duisburg Essen, Duisburg, 47057, Germany — 2Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China — 3Department of Material- and Geosciences, Functional Materials, Technical University Darmstadt, Germany

Non-centrosymmetric crystal structures like cubic FeGe show an antisymmetric exchange often denoted as Dzyaloshinskii-Moriya interaction (DMI). In addition to static spin structures like helices or skyrmions DMI leads to a shift of the dispersion curve. We investigated the dynamic magnetic properties of millimeter and micrometer sized polycrystalline FeGe samples using resonator-based X-band and K-band ferromagnetic resonance (FMR). The measurements reveal unidirectional anisotropy [1], i.e. a change of the resonance position of up to 30 mT after inversion of the magnetic field direction. This difference is present at all investigated temperatures (80K - 280K), frequencies and sample sizes.

[1] N. Josten et al., Dynamic unidirectional anisotropy in cubic FeGe with antisymmetric spin-spin-coupling, submitted to Scientific Reports.

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