Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.10: Poster
Thursday, March 15, 2018, 15:00–18:00, Poster C
No significant effect of spin-pumping in Fe/Ag/Pt heterostructures — •Paul Wendtland, Babli Bhagat, Michael Farle, and Florian M. Römer — Fakultät für Physik und Center for Nanointegration (CENIDE) Universität Duisburg-Essen
Goal of this experiment was to determine the influence of conductive capping layers on the magnetic damping in an Fe thin film.
We created an epitaxial 5 nm Fe film on GaAs(100) and performed in-situ multifrequency Ferromagnetic Resonance (FMR) measurements from 9-15 GHz in [110]-direction. The static properties were determined as well. The same film was then capped with increasing amounts of Ag (up to 25 nm) and finally Pt (4 nm), with FMR measurements conducted in between.
By fitting the FMR lines with a dyson-shape model, we determined the FMR linewidth with an accuracy of about 5 %. The resulting Gilbert damping factors are in the range of ((3.8 ... 4.1) ± 0.3) · 10−3 without a systematic capping dependence. Thus, contrary to theoretical predictions, no effect of spin-pumping was observed as the Gilbert damping factor did not change within the error bars. However, a frequency-independent linewidth increase of up to 80 % was observed.