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

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 $47kA/m$ 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.

6 pages, 5 figures

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• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• Damping Enhancement in YIG at Millikelvin Temperatures due to GGG Substrate
• High-performance magnetostatic wave resonators through deep anisotropic etching of GGG substrates
• Wavenumber-dependent magnetic losses in YIG-GGG heterostructures at millikelvin temperatures
• Elimination of substrate-induced FMR linewidth broadening in the epitaxial system YIG-GGG by microstructuring
• YSGAG: The Ideal Substrate for YIG in Quantum Magnonics
• Unified theory of magnetization temperature dependence in ferrimagnets