Coupling phase interference effects in a multimode cavity magnonics system

• URL: http://arxiv.org/abs/2607.20234v1
• Date: Wed, 22 Jul 2026 14:54:39 GMT
• Title: Coupling phase interference effects in a multimode cavity magnonics system
• Abstract summary: Coupling phases play a decisive yet often overlooked role in cavity magnonics.<n>We investigate phase-mediated interference effects in a cavity magnonics system.<n>Results establish coupling-phase engineering as a key principle for accurately modeling and designing multimode cavity magnonics devices.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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