Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.30: Poster
Tuesday, April 2, 2019, 10:00–13:00, Poster E
Levitating antennas to excite magnetization dynamics for optical and non-optical spectroscopy — •Toni Hache1,2, Marek Vanatka3, Lukas Flajsman3, Michal Urbanek3, and Helmut Schultheiss1,4 — 1HZDR — 2TU Chemnitz — 3CEITEC — 4TU Dresden
Modern spectroscopic techniques for the investigation of magnetization dynamics in microstructures use usually microwave antennas which are directly patterned on the sample using electron-beam-lithography (EBL). Following this approach every magnetic structure on the sample needs its own antenna and insulation layer requiring additional EBL and layer deposition. We demonstrate a new device for magnetization excitation compatible with optical methods based on antennas on a flexible glass cantilever. Since we use flexible transparent glass as substrate, optical spectroscopic techniques like Brillouin-light-scattering microscopy (BLS) and time resolved magneto-optical Kerr effect measurements (TRMOKE) can be performed. This cantilever is connected to adapters with standard SMA connectors and is positionable in all three dimensions to get access to all magnetic structures on the sample under investigation. We show the functionality of these antennas using BLS. We excite the magnetization in a 5 nm thick Permalloy film and compare the intensity with the intensity of only thermally excited magnons. A increase by a factor of 400 could be achieved, showing the high impact of the magnetization excitation by the antenna. The authors acknowledge financial support from the Deutsche Forschungsgemeinschaft within programme SCHU 2922/1-1