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Cavity-mediated coherent coupling of magnetic moments

N. J. Lambert, J. A. Haigh, S. Langenfeld, A. C. Doherty, and A. J. Ferguson
Phys. Rev. A 93, 021803(R) – Published 16 February 2016

Abstract

We demonstrate the long-range strong coupling of magnetostatic modes in spatially separated ferromagnets mediated by a microwave frequency cavity. Two spheres of yttrium iron garnet are embedded in the cavity and their magnetostatic modes probed using a dispersive measurement technique. We find they are strongly coupled to each other even when detuned from the cavity modes, and investigate the dependence of the magnet-magnet coupling on the cavity detuning. Dark states of the coupled magnetostatic modes of the system are observed, and ascribed to mismatches between the symmetries of the modes and the drive field.

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  • Received 6 July 2015
  • Revised 15 January 2016

DOI:https://doi.org/10.1103/PhysRevA.93.021803

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

N. J. Lambert1, J. A. Haigh2, S. Langenfeld1, A. C. Doherty3, and A. J. Ferguson1,*

  • 1Microelectronics Group, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom
  • 2Hitachi Cambridge Laboratory, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom
  • 3Centre for Engineered Quantum Systems, School of Physics, University of Sydney, Sydney, NSW 2006, Australia

  • *ajf1006@cam.ac.uk

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Issue

Vol. 93, Iss. 2 — February 2016

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