Propagating spin-wave spectroscopy in nanometer-thick YIG films at millikelvin temperatures

• URL: http://arxiv.org/abs/2212.02257v1
• Date: Mon, 5 Dec 2022 13:27:26 GMT
• Title: Propagating spin-wave spectroscopy in nanometer-thick YIG films at millikelvin temperatures
• Authors: Sebastian Knauer, Krist\'yna Dav\'idkov\'a, David Schmoll, Rostyslav O. Serha, Andrey Voronov, Qi Wang, Morris Lindner, Timmy Reimann, Carsten Dubs, Michal Urb\'anek, Andrii Chumak
• Abstract summary: We demonstrate spin-wave propagation in a $100,mathrmnm$-thick yttrium-iron-garnet film at the temperatures down to $45,mathrmmK$. The developed fabrication and measurement methodologies enable the realisation of integrated magnonic quantum nanotechnologies at millikelvin temperatures.
• Score: 6.633461441227305
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Performing propagating spin-wave spectroscopy of thin films at millikelvin temperatures is the next step towards the realisation of large-scale integrated magnonic circuits for quantum applications. Here we demonstrate spin-wave propagation in a $100\,\mathrm{nm}$-thick yttrium-iron-garnet film at the temperatures down to $45 \,\mathrm{mK}$, using stripline nanoantennas deposited on YIG surface for the electrical excitation and detection. The clear transmission characteristics over the distance of $10\,\mu \mathrm{m}$ are measured and the subtracted spin-wave group velocity and the YIG saturation magnetisation agree well with the theoretical values. We show that the gadolinium-gallium-garnet substrate influences the spin-wave propagation characteristics only for the applied magnetic fields beyond $75\,\mathrm{mT}$, originating from a GGG magnetisation up to $47 \,\mathrm{kA/m}$ at $45 \,\mathrm{mK}$. Our results show that the developed fabrication and measurement methodologies enable the realisation of integrated magnonic quantum nanotechnologies at millikelvin temperatures.

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