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

Boventer I, Pfirrmann M, Krause J, Schoen Y, Klaeui M, Weides M (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Physical Review B American Physical Society

Book Volume: 97

Article Number: 184420

Journal Issue: 18

DOI: 10.1103/PhysRevB.97.184420

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 290K to 30mK. 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 1K. We compare the temperature dependence of the coupling strength geff(T), describing the strength of coherent energy exchange between spin ensemble and cavity photon, to the temperature behavior of the saturation magnetization evolution Ms(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 40K. The linewidth κm decreases to 1.2MHz at 30mK, 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.

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

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

MLA:

Boventer, Isabella, et al. "Complex temperature dependence of coupling and dissipation of cavity magnon polaritons from millikelvin to room temperature." Physical Review B 97.18 (2018).

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