Coupling phase interference effects in a multimode cavity magnonics system
Abstract
Coupling phases play a decisive yet often overlooked role in cavity magnonics, particularly in complex multimode systems. Here, we investigate phase-mediated interference effects in a cavity magnonics system comprising a four-post re-entrant microwave cavity coupled to Yttrium Iron Garnet (YIG) spheres. Using an input-output model that explicitly accounts for both internal and external coupling phases, we achieve agreement with experimental microwave transmission measurements. Our results unravel the emergence of a positionally-dependent uncoupled mode due to interference of cavity photon-magnon (internal) coupling phases. Further, we experimentally observed large nonreciprocity at the antiresonance frequencies and show that this feature arises due to the far-detuned modes' odd parity cavity photon-probe (external) coupling phase interfering with the internal coupling phases. Bridging theory, simulation and experiment, these results establish coupling-phase engineering as a key principle for accurately modeling and designing multimode cavity magnonics devices. In this work, we explain the origin of a position-selective coupling to degenerate discrete whispering-gallery-modelike modes, and nonreciprocal transmission for special YIG arrangements through the lens of coupling phases. We show in this work that the selective coupling can be traced to interference effects of internal coupling phases, while the nonreciprocal transmission to be caused by the interference between internal and external coupling phases of far detuned modes. The results presented in this work establish coupling-phase engineering as a key principle for accurately modelling and designing cavity magnonics devices.
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BibTeX
@misc{avicena2026coupling,
title = {{Coupling phase interference effects in a multimode cavity magnonics system}},
author = {M. Avicena and G. Bourcin and V. Vlaminck and J. Bourhill and V. Castel},
howpublished = {HAL},
year = {2026},
month = jul,
doi = {10.48550/arxiv.2607.20234},
eprint = {2607.20234},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05836278v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Coupling phase interference effects in a multimode cavity magnonics system
AU - M. Avicena
AU - G. Bourcin
AU - V. Vlaminck
AU - J. Bourhill
AU - V. Castel
PY - 2026
DA - 2026/07/22
PB - HAL
DO - 10.48550/arxiv.2607.20234
UR - https://hal.science/hal-05836278v1
AB - Coupling phases play a decisive yet often overlooked role in cavity magnonics, particularly in complex multimode systems. Here, we investigate phase-mediated interference effects in a cavity magnonics system comprising a four-post re-entrant microwave cavity coupled to Yttrium Iron Garnet (YIG) spheres. Using an input-output model that explicitly accounts for both internal and external coupling phases, we achieve agreement with experimental microwave transmission measurements. Our results unravel the emergence of a positionally-dependent uncoupled mode due to interference of cavity photon-magnon (internal) coupling phases. Further, we experimentally observed large nonreciprocity at the antiresonance frequencies and show that this feature arises due to the far-detuned modes' odd parity cavity photon-probe (external) coupling phase interfering with the internal coupling phases. Bridging theory, simulation and experiment, these results establish coupling-phase engineering as a key principle for accurately modeling and designing multimode cavity magnonics devices. In this work, we explain the origin of a position-selective coupling to degenerate discrete whispering-gallery-modelike modes, and nonreciprocal transmission for special YIG arrangements through the lens of coupling phases. We show in this work that the selective coupling can be traced to interference effects of internal coupling phases, while the nonreciprocal transmission to be caused by the interference between internal and external coupling phases of far detuned modes. The results presented in this work establish coupling-phase engineering as a key principle for accurately modelling and designing cavity magnonics devices.
ER -