Presentazioni e Articoli Tecnici

Abstract We present a chip-scale planar cavity platform based on an attached split-ring resonator (ASRR) integrated with yttrium iron garnet (YIG) structures to achieve strong magnon–photon coupling in a compact hybrid system. The ASRR geometry was numerically optimized by tuning inter-ring spacing, gap width, substrate thickness, and permittivity, resulting in a quality factor of Q\ \approx\ 190 at 5.48 GHz, enabling strong microwave magnetic-field confinement and reduced radiative losses. The optimized cavity was coupled to YIG elements of three geometries: full ring, half ring, and disk. Full electromagnetic simulations show that the full-ring geometry exhibits balanced performance with coupling strength 115 MHz and cooperativity 13.10, while the half-ring shows a comparable coupling strength of 108 MHz and slightly higher cooperativity 13.50, despite edge-induced demagnetizing effects. In contrast, the disk geometry couples at lower bias magnetic fields and achieves the strongest interaction (135 MHz, 25.30), enabled by improved microwave magnetic-field overlap. These results demonstrate that geometry, rather than magnetic volume alone, is a key design parameter for tailoring magnon–photon coupling, providing a practical framework for lithography-compatible, on-chip hybrid magnonic and quantum devices.