Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 4: DPG Promotionskolleg Next Generation Computing
MON 4.3: Talk
Monday, September 8, 2025, 14:45–15:00, ZHG004
Towards a Parallel Electrical Read-Out for Spin-Wave-Based Spectrometers — •Johannes Greil1, Felix Naunheimer1, Valentin Ahrens1, Manuel Wilke1, Tobias Mohr1, Levente Maucha2, Ádám Papp2, György Csaba2, and Markus Becherer1 — 1Technical Universtiy of Munich, Munich, Germany — 2Pázmány Peter Catholic University, Budapest, Hungary
This work presents the fine-tuning and electrical characterization of a demonstrator that combines a magnonic spectrometer in the Rowland circle arrangement with an RF circuit board for electrical read-out. We fabricate the Rowland circles by sputter deposition of Yttrium-Iron-Garnet (YIG) on a Gadolinium-Gallium-Garnet (GGG) substrate, followed by wet-chemical etching of the amorphous YIG film. In a subsequent lithography step, we fabricate a curved stripline transducer as input and several u-shaped transducers as local pick-ups for the output. We have achieved a mono-frequent detection resolution of around 45MHz in a usable band of 180MHz using time-resolved MOKE (trMOKE) measurements. With this system, we could successfully show that two-tone excitation and, consequently, wavefront separation is possible. The next step toward a more self-standing demonstrator device is the electrical detection of the locally picked-up magnonic signals. For this, we suggest a simple yet powerful method of power detection using RF diodes instead of RF amplifiers or mixers. To perform such measurements, we designed a circuit board providing one RF power detector per pick-up transducer, which can be read using any analog-to-digital converter (ADC).
Keywords: spin-wave computing; magnonic devices; rowland circle