Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Magnonics II
MA 48.1: Vortrag
Donnerstag, 12. März 2026, 15:00–15:15, HSZ/0004
Linear and nonlinear zero-field spin waves in transversally magnetised low-damping, half-metallic Co2MnSi waveguides — •Anna Maria Friedel1,2, Moritz Bechberger1, Björn Heinz1, Sébastien Petit-Watelot2, Stéphane Andrieu2, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine, 54000 Nancy, France
We report on zero-field spin waves in the linear and nonlinear regime propagating over tens of micrometers in transversally magnetised Co2MnSi waveguides. The remanent configuration is stabilised by the intrinsic cubic magnetocrystalline anisotropy of the L21-ordered Heusler compound, which enables an operation in the favourable Damon-Eshbach geometry, yielding large spin wave group velocities and propagation lengths associated with the large saturation magnetisation Ms≈1000 kA/m and the low Gilbert damping α≤10−3 in the half-metallic, L21-ordered Co2MnSi. The cubic anisotropy not only allows for a reconfigurable remanent geometry and stable remanent operation, but also impacts the nonlinear magnetisation dynamics, yielding for instance a first order instability suppression range over several GHz. Investigating the linear and nonlinear dynamics in microstructured waveguides in remanence by Brillouin light scattering, this study consolidates the great interest in the half-metallic Co2MnSi particularly for hybrid magnonic-spintronic applications at zero external bias fields.
Keywords: Zero-field spin waves; Nonlinear spin waves; Anisotropy; Half-metal magnonics; Heusler compounds