Microwave magnon damping in YIG films at millikelvin temperatures
Sandoko Kosen,A. F. van Loo,Dmytro A. Bozhko,Dmytro A. Bozhko,Dmytro A. Bozhko,Laura Mihalceanu,A. D. Karenowska +6 more
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In this article, 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.Abstract:
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.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.read more
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Journal ArticleDOI
Hybrid quantum systems with circuit quantum electrodynamics
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TL;DR: A review of recent research on the creation of hybrid quantum systems based on circuit quantum electrodynamics, encompassing mechanical oscillators, quantum acoustodynamics with surface acoustic waves, quantum magnonics and coupling between superconducting circuits and ensembles or single spins can be found in this paper.
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Hybrid magnonics: Physics, circuits, and applications for coherent information processing
TL;DR: In this paper, the authors focus on the recent rapid developments of magnon-based hybrid systems, which seek to combine magnonic excitations with diverse excitations for transformative applications in devices, circuits, and information processing.
Journal ArticleDOI
An Introduction to Spin Wave Computing
Abdulqader Mahmoud,Florin Ciubotaru,Frederic Vanderveken,Andrii V. Chumak,Said Hamdioui,Christoph Adelmann,Sorin Cotofana +6 more
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References
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Book ChapterDOI
Magnon Spintronics : Fundamentals of Magnon-Based Computing
TL;DR: In this article, a selection of fundamental topics that form the basis of the magnon-based computing and are of primary importance for the further development of the concept are addressed, including the transport of spin-wave-carried information in one and two dimensions that is required for the realization of logic elements and integrated magnon circuits.
Journal ArticleDOI
Bose–Einstein condensation of quasi-equilibrium magnons at room temperature under pumping
Sergej O. Demokritov,Vladislav E. Demidov,O. Dzyapko,G. A. Melkov,Alexander A. Serga,Burkard Hillebrands,Andrei Slavin +6 more
TL;DR: By using a technique of microwave pumping it is possible to excite additional magnons and to create a gas of quasi-equilibrium magnons with a non-zero chemical potential, and a Bose condensate of magnons is formed.
Book
Amorphous solids : low-temperature properties
TL;DR: In this article, the authors proposed a tunneling model based on the Vibrational Density of States of Amorphous Semiconductors (VDS) and three-pulse electric echo.