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Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.59: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Spin Pumping and Low Gilbert Damping in Co25Fe75 Heterostructures — •Luis Flacke1,2, Lukas Liensberger1,2, David Rogerson1,2, Matthias Althammer1,2, Hans Huebl1,2,3, Stephan Gerprägs2, Katrin Schultheiss4, Aleksandr Buzdakov4, Tobias Hula4, Helmut Schultheiss4, Eric Edwards5, Hans Nembach5, Justin Shaw5, Rudolf Gross1,2,3, and Mathias Weiler1,21Physics-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.

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