Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.59: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Spin Pumping and Low Gilbert Damping in Co₂₅Fe₇₅ Heterostructures — •Luis Flacke^1,2, Lukas Liensberger^1,2, David Rogerson^1,2, Matthias Althammer^1,2, Hans Huebl^1,2,3, Stephan Gerprägs², Katrin Schultheiss⁴, Aleksandr Buzdakov⁴, Tobias Hula⁴, Helmut Schultheiss⁴, Eric Edwards⁵, Hans Nembach⁵, Justin Shaw⁵, Rudolf Gross^1,2,3, and Mathias Weiler^1,2 — ¹Physics-Department, Technical University of Munich, Garching, Germany — ²Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ³Nanosystems Initiative Munich, Munich, Germany — ⁴Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ⁵National Institue of Standards and Technology, Boulder, CO, USA

Itinerant ferromagnets offer advantages for magnonic and spintronic devices, but typically suffer from drastically higher Gilbert damping than insulating ferrimagnets. We fabricated and investigated low-damping Co₂₅Fe₇₅-heterostructures and separated Gilbert damping and spin pumping contributions to the total damping using broadband ferromagnetic resonance spectroscopy. From our measurements, we extrapolate that the intrinsic damping of the magnetic alloy reaches the low 10⁻³ regime. The extracted damping is in agreement with microfocused Brillouin-Light-Scattering experiments, which spatially resolve the spin wave propagation in patterned devices.

Financial support by Deutsche Forschungsgemeinschaft via projects WE5386/4 and WE5386/5 is gratefully acknowledged.