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arXiv · 2506.11867

Current-Controlled Magnon-Magnon Coupling in an On-Chip Cavity Resonator

Hanchen Wang·William Legrand·Richard Schlitz·Pietro Gambardella
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Abstract

Harnessing spin currents to control magnon dynamics enables new functionalities in magnonic devices. Here, we demonstrate current-controlled magnon-magnon coupling between cavity and boundary modes in an ultrathin film of Bi-doped yttrium iron garnet (BiYIG). Cavity modes emerge in a BiYIG region between two Pt nanostripes, where interfacial anisotropy modifies the magnon dispersion. These modes hybridize with boundary magnons confined within the Pt-capped BiYIG, resulting in an anticrossing gap. Modeling based on dipole-exchange spin-wave dispersion accurately reproduces the observed modes and their hybridization. Spin current injection via the spin Hall effect in a Pt nanostripe disrupts the cavity boundary conditions and suppresses both cavity modes and hybridization upon driving the system beyond the damping compensation threshold. Furthermore, tuning the microwave power applied to a microstrip antenna enables controlled detuning of the anticrossing gap. Our findings provide a platform for exploring spin current-magnon interactions and designing on-chip reconfigurable magnonic devices.

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Hanchen Wang, William Legrand, Richard Schlitz, Pietro Gambardella. 2025-06-13. Current-Controlled Magnon-Magnon Coupling in an On-Chip Cavity Resonator. https://doi.org/10.1021/acs.nanolett.5c01746

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