Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Magnetization and Demagnetization Dynamics I

MA 16.7: Talk

Tuesday, March 8, 2016, 11:15–11:30, H34

Study of FM/Pt,Ta bilayers for spin pumping by ferromagnetic resonance spectroscopy — •Andrés Conca, Sascha Keller, Björn Heinz, Laura Mihalceanu, Evangelos Papaioannou, and Burkard Hillebrands — FB Physik und Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

The generation of pure spin currents without accompanying charge currents is of large importance for spintronics and is called to play a critical role in the design of future spintronic devices. The creation and injection of a spin current into a non-magnetic (NM) material from a ferromagnetic (FM) one is commonly referred to as spin pumping. Metallic FM/Pt bilayers show a large increase in magnetic damping due to the presence of spin pumping, and large inverse spin Hall voltages (ISHE) are observed. Valuable information can be gained with FMR techniques without the disturbance of rectification effects present in ISHE measurements. Concretely the parameter g^↑↓ is accessible.

Here we report on a study of the influence of spin pumping on the FMR properties by using a model epitaxial metallic system of Fe(100)/Pt bilayers and discuss the possible origin of the different observed phenomena. Additional reference samples with no Pt have been also measured to estimate the properties in absence of spin pumping. Additionally, we present also data on CoFeB/Pt and CoFeB/Ta systems to compare the situation with polycrystalline systems.

Support by the Carl Zeiss Stiftung and by M-era.Net is acknowledged.