Damping enhancement in YIG at millikelvin temperatures due to GGG substrate

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F26%3A0197895" target="_blank" >RIV/00216305:26620/26:0197895 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S2950257825000034" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2950257825000034</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.mtquan.2025.100025" target="_blank" >10.1016/j.mtquan.2025.100025</a>

Result language
angličtina
Original language name
Damping enhancement in YIG at millikelvin temperatures due to GGG substrate
Original language description
Quantum magnonics aims to exploit the quantum mechanical properties of magnons for nanoscale quantum information technologies. Ferrimagnetic yttrium iron garnet (YIG), which offers the longest magnon lifetimes, is a key material typically grown on gadolinium gallium garnet (GGG) substrates for structural compatibility. However, the increased magnetic damping in YIG/GGG systems below 50 K poses a challenge for quantum applications. Here, we study the damping in a 97 nm-thick YIG film on a -thick GGG substrate at temperatures down to 30 mK using ferromagnetic resonance (FMR) spectroscopy. We show that the dominant physical mechanism for the observed tenfold increase in FMR linewidth at millikelvin temperatures is the non-uniform bias magnetic field generated by the partially magnetized paramagnetic GGG substrate. Numerical simulations and analytical theory show that the GGG-driven linewidth enhancement can reach up to 6.7 times. In addition, at low temperatures and frequencies above 18 GHz and temperatures below 2 K and frequencies above 10 GHz, the FMR linewidth deviates from the viscous Gilbert-damping model. These results allow the partial elimination of the damping mechanisms attributed to GGG, which is necessary for the advancement of solid-state quantum technologies.
Czech name
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Czech description
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Type
J<sub>ost</sub> - Miscellaneous article in a specialist periodical
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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