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arXiv · 1802.07113

Magnon-photon coupling in a non-collinear magnetic insulator Cu$_2$OSeO$_3$

L. V. Abdurakhimov·S. Khan·N. A. Panjwani·J. D. Breeze·M. Mochizuki·S. Seki·Y. Tokura·J. J. L. Morton·H. Kurebayashi
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Abstract

Anticrossing behavior between magnons in a non-collinear chiral magnet Cu$_2$OSeO$_3$ and a two-mode X-band microwave resonator was studied in the temperature range 5-100K. In the field-induced ferrimagnetic phase, we observed a strong coupling regime between magnons and two microwave cavity modes with a cooperativity reaching 3600. In the conical phase, cavity modes are dispersively coupled to a fundamental helimagnon mode, and we demonstrate that the magnetic phase diagram of Cu$_2$OSeO$_3$ can be reconstructed from the measurements of the cavity resonance frequency. In the helical phase, a hybridized state of a higher-order helimagnon mode and a cavity mode - a helimagnon polariton - was found. Our results reveal a new class of magnetic systems where strong coupling of microwave photons to non-trivial spin textures can be observed.

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L. V. Abdurakhimov, S. Khan, N. A. Panjwani, J. D. Breeze, M. Mochizuki, S. Seki, Y. Tokura, J. J. L. Morton, H. Kurebayashi. 2019-02-15. Magnon-photon coupling in a non-collinear magnetic insulator Cu$_2$OSeO$_3$. https://doi.org/10.1103/physrevb.99.140401

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