Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 9: INNOMAG e.V. Prizes 2022 (Diplom-/Master and Ph.D. Thesis)
MA 9.2: Talk
Monday, September 5, 2022, 15:20–15:40, H43
Magnetisation dynamics in epitaxial Co2Mn-based Heusler thin films with ultralow damping for thicknesses below 50 nm — •Anna M. Friedel1,2, Claudia de Melo2, Victor Palin2,3, Sébastien Petit-Watelot2, Stéphane Andrieu2, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany — 2Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine, Nancy, France — 3Synchrotron SOLEIL-CNRS, L’Orme des Merisiers, Gif-sur-Yvette, France
For future applications of magnetisation dynamics, materials with low Gilbert damping are indispensable. Co2Mn-based Heusler compounds are considered excellent candidates as they combine high saturation magnetisation, high Curie temperature, half-metallicity and ultralow Gilbert damping, especially when grown epitaxially with decent control over stoichiometry to ensure the desired chemical ordering [1]. However, downscaling towards microstructures is a challenge in which the fabrication of high-quality ultrathin films with consistent excellent properties is a crucial step. We succeeded in the epitaxial growth of high-quality Co2MnSi Heusler films in the thickness range of 4-44 nm for all of which the half-metallicity was confirmed [2]. Consequently, an ultralow Gilbert damping was obtained for the whole series reaching down to 7.8×10-4 for the 8 nm film. Coupling effects and magnetisation dynamics in heterostructures are currently under investigation.
[1] C. Guillemard, et al., J. Appl. Phys. 128, 241102 (2020)
[2] C. de Melo, et al., Appl. Mater. Today 25, 101174 (2021)