Complex temperature dependence of coupling and dissipation of cavity magnon polaritons from millikelvin to room temperature

Boventer, I., Pfirrmann, M., Krause, J., Schön, Y., Kläui, M. and Weides, M. (2018) Complex temperature dependence of coupling and dissipation of cavity magnon polaritons from millikelvin to room temperature. Physical Review B, 97(18), 184420. (doi:10.1103/PhysRevB.97.184420)

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Abstract

Hybridized magnonic-photonic systems are key components for future information processing technologies such as storage, manipulation, or conversion of data both in the classical (mostly at room temperature) and quantum (cryogenic) regime. In this work, we investigate a yttrium-iron-garnet sphere coupled strongly to a microwave cavity over the full temperature range from 290 K to 30 mK . The cavity-magnon polaritons are studied from the classical to the quantum regimes where the thermal energy is less than one resonant microwave quanta, i.e., at temperatures below 1 K . We compare the temperature dependence of the coupling strength g eff ( T ) , describing the strength of coherent energy exchange between spin ensemble and cavity photon, to the temperature behavior of the saturation magnetization evolution M s ( T ) and find strong deviations at low temperatures. The temperature dependence of magnonic disspation is governed at intermediate temperatures by rare-earth impurity scattering leading to a strong peak at 40 K . The linewidth κ m decreases to 1.2 MHz at 30 mK , making this system suitable as a building block for quantum electrodynamics experiments. We achieve an electromagnonic cooperativity in excess of 20 over the entire temperature range, with values beyond 100 in the millikelvin regime as well as at room temperature. With our measurements, spectroscopy on strongly coupled magnon-photon systems is demonstrated as versatile tool for spin material studies over large temperature ranges. Key parameters are provided in a single measurement, thus simplifying investigations significantly.

Item Type:Articles
Additional Information:This work was supported by the European Research Council (ERC) under Grant No. 648011 and through SFB TRR 173/Spin+X.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Boventer, I., Pfirrmann, M., Krause, J., Schön, Y., Kläui, M., and Weides, M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:2469-9950
ISSN (Online):2469-9969
Published Online:16 May 2018
Copyright Holders:Copyright © 2018 American Physical Society
First Published:First published in Physical Review B 97(18): 184420
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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