Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.40: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Propagating spin waves spectroscopy of YIG magnonic crystal — •Hugo Merbouche, Martin Collet, Lucile Soumah, Paolo Bortolotti, Vincent Cros, and Abdelmadjid Anane — Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France

The propagation of Damon-Eshbach spin waves in a magnonic crystal (MC) is studied. The MC consists of periodically nanostructured waveguides (WGs) made out of 20 nm thick YIG film. We observe a 25MHz transmission gap at 1.3GHz. Fifty parallel 2.5µm wide WGs are designed, using laser lithography. Two gold antennas are deposited on top, 30µm apart. Using electron beam lithography and dry ion etching, 150nm wide grooves, orthogonal to the WGs principal axis, are etched. The period corresponds to a Bragg k-vector of 1µ m⁻¹ and the depth is incremented from 0 to 20nm in 6 steps.

The propagation properties are then measured using a VNA based all-inductive method: Propagating Spin Wave Spectroscopy (PSWS). For un-etched WGs, a good agreement with theoretical expectations is observed. For MCs with grooves depth greater than 5nm, a 25MHz transmission gap at 1.3GHz is measured, corresponding to a decrease by a factor 2.4 of the output signal. Transmission outside the frequency gap is unaffected by the grooves till a depth of about 10nm. Nevertheless, the signal remains strong even when the YIG film becomes discontinuous.