Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 45: Magnonics I
MA 45.10: Talk
Thursday, March 19, 2020, 12:00–12:15, HSZ 401
Phase-sensitive and Spatially Resolved Detection of Magnetization Dynamics — •Lukas Liensberger1,2, Luis Flacke1,2, David Rogerson1,2, Matthias Althammer1,2, Rudolf Gross1,2,3, and Mathias Weiler1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Germany — 2Physik-Department, Technische Universität München, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Germany
In the recent years, many advances in utilizing spinwaves and their quanta, magnons, have been made in order to transport and store information. The precise and accurate determination of dynamic magnetic properties like magnetic damping and spinwave propagation length is essential to design magnonic devices. The established broadband ferromagnetic resonance spectroscopy with a vector network analyzer (BMR) is the key technique to determine damping characteristics in unpatterned samples. It however lacks the ability to measure the magnetization dynamics locally and to detect propagating spinwaves with non-zero wavenumber.
Here, we establish the micro-focused frequency-resolved magneto-optic Kerr effect (µFR-MOKE), which is essentially a spatially resolved BMR technique with sub-micrometer resolution. We present µFR-MOKE studies of propagating micrometer-scale spinwaves in microstructured ferromagnet/normal metal samples with Co25Fe75 as the ferromagnet and compare the µFR-MOKE results to those obtained using established micro-focused Brillouin light scattering.
We acknowledge financial support by the DFG via project WE5386/4-1.