Microwave magnon damping in YIG films at millikelvin temperatures

Magnon systems used in quantum devices require low damping if coherence is to be maintained. The ferrimagnetic electrical insulator yttrium iron garnet (YIG) has low magnon damping at room temperature and is a strong candidate to host microwave magnon excitations in future quantum devices. Monocryst...

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Main Authors: S. Kosen, A. F. van Loo, D. A. Bozhko, L. Mihalceanu, A. D. Karenowska
Format: Article
Language:English
Published: AIP Publishing LLC 2019-10-01
Series:APL Materials
Online Access:http://dx.doi.org/10.1063/1.5115266
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author S. Kosen
A. F. van Loo
D. A. Bozhko
L. Mihalceanu
A. D. Karenowska
author_facet S. Kosen
A. F. van Loo
D. A. Bozhko
L. Mihalceanu
A. D. Karenowska
author_sort S. Kosen
collection DOAJ
description Magnon systems used in quantum devices require low damping if coherence is to be maintained. The ferrimagnetic electrical insulator yttrium iron garnet (YIG) has low magnon damping at room temperature and is a strong candidate to host microwave magnon excitations in future quantum devices. Monocrystalline YIG films are typically grown on gadolinium gallium garnet (GGG) substrates. In this work, comparative experiments made on YIG waveguides with and without GGG substrates indicate that the material plays a significant role in increasing the damping at low temperatures. Measurements reveal that damping due to temperature-peak processes is dominant above 1 K. Damping behavior that we show can be attributed to coupling to two-level fluctuators (TLFs) is observed below 1 K. Upon saturating the TLFs in the substrate-free YIG at 20 mK, linewidths of ∼1.4 MHz are achievable: lower than those measured at room temperature.
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spelling doaj.art-4b031b46b5504711b4b577e2278792082022-12-22T01:48:01ZengAIP Publishing LLCAPL Materials2166-532X2019-10-01710101120101120-610.1063/1.5115266Microwave magnon damping in YIG films at millikelvin temperaturesS. Kosen0A. F. van Loo1D. A. Bozhko2L. Mihalceanu3A. D. Karenowska4Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United KingdomClarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United KingdomFachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universitaet Kaiserslautern, 67663 Kaiserslautern, GermanyFachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universitaet Kaiserslautern, 67663 Kaiserslautern, GermanyClarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United KingdomMagnon systems used in quantum devices require low damping if coherence is to be maintained. The ferrimagnetic electrical insulator yttrium iron garnet (YIG) has low magnon damping at room temperature and is a strong candidate to host microwave magnon excitations in future quantum devices. Monocrystalline YIG films are typically grown on gadolinium gallium garnet (GGG) substrates. In this work, comparative experiments made on YIG waveguides with and without GGG substrates indicate that the material plays a significant role in increasing the damping at low temperatures. Measurements reveal that damping due to temperature-peak processes is dominant above 1 K. Damping behavior that we show can be attributed to coupling to two-level fluctuators (TLFs) is observed below 1 K. Upon saturating the TLFs in the substrate-free YIG at 20 mK, linewidths of ∼1.4 MHz are achievable: lower than those measured at room temperature.http://dx.doi.org/10.1063/1.5115266
spellingShingle S. Kosen
A. F. van Loo
D. A. Bozhko
L. Mihalceanu
A. D. Karenowska
Microwave magnon damping in YIG films at millikelvin temperatures
APL Materials
title Microwave magnon damping in YIG films at millikelvin temperatures
title_full Microwave magnon damping in YIG films at millikelvin temperatures
title_fullStr Microwave magnon damping in YIG films at millikelvin temperatures
title_full_unstemmed Microwave magnon damping in YIG films at millikelvin temperatures
title_short Microwave magnon damping in YIG films at millikelvin temperatures
title_sort microwave magnon damping in yig films at millikelvin temperatures
url http://dx.doi.org/10.1063/1.5115266
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