High Cooperativity in Coupled Microwave Resonator Ferrimagnetic Insulator Hybrids

Hans Huebl, Christoph W. Zollitsch, Johannes Lotze, Fredrik Hocke, Moritz Greifenstein, Achim Marx, Rudolf Gross, and Sebastian T. B. Goennenwein
Phys. Rev. Lett. 111, 127003 – Published 20 September 2013
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Abstract

We report the observation of strong coupling between the exchange-coupled spins in a gallium-doped yttrium iron garnet and a superconducting coplanar microwave resonator made from Nb. The measured coupling rate of 450 MHz is proportional to the square root of the number of exchange-coupled spins and well exceeds the loss rate of 50 MHz of the spin system. This demonstrates that exchange-coupled systems are suitable for cavity quantum electrodynamics experiments, while allowing high integration densities due to their spin densities of the order of one Bohr magneton per atom. Our results furthermore show, that experiments with multiple exchange-coupled spin systems interacting via a single resonator are within reach.

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  • Received 30 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.111.127003

© 2013 American Physical Society

Authors & Affiliations

Hans Huebl1,*, Christoph W. Zollitsch1, Johannes Lotze1, Fredrik Hocke1, Moritz Greifenstein1, Achim Marx1, Rudolf Gross1,2, and Sebastian T. B. Goennenwein1

  • 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
  • 2Physik-Department, Technische Universität München, 85748 Garching, Germany

  • *Corresponding author. huebl@wmi.badw.de

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Vol. 111, Iss. 12 — 20 September 2013

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