Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.17: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Ferromagnetic Resonance of Co₂MnGa Thin Films — •Peter Swekis^1,2, Anastasios Markou¹, Yi-Cheng Chen¹, Jörg Sichelschmidt¹, Stefan Klingler^3,4, Mathias Weiler^3,4, Sebastian T.B. Gönnenwein², and Claudia Felser¹ — ¹Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany — ²TU Dresden, Institute of Solid State Physics, Helmholzstr. 40, 01069 Dresden, Germany — ³Walther Meißner Institute, Walther-Meißner-Straße 8, 85748 Garching, Germany — ⁴TU München, Physics-Department, 85748 Garching, Germany

Heusler compounds are a widely studied class of materials interesting for spintronic applications due to a number of magnetic and electronic properties, such as high spin polarization and elevated Curie temperatures. The dynamic response to gigahertz frequencies becomes particularly interesting and has to be investigated in relevant structures. We studied Co₂MnGa thin films of various thicknesses (10-80 nm) with cavity FMR (X-Band) as well as broadband FMR to determine damping, g-factor, effective magnetization and anisotropy constants. First results show a trend of all parameters with changing thickness. Furthermore, we observed unusual oscillating behavior of the broadband FMR linewidth with frequency as well as 8-fold symmetry of the anisotropy in cavity FMR in-plane measurements.