One of the main challenges in magnonics is the efficiency of the conversion of microwave signals into spin waves. This efficiency is low due to the significant mismatch between microwave and spin-wave wavelengths in the gigahertz range (${10}^{-2}$ and ${10}^{-8}$ m, respectively), leading to high energy consumption in magnonic circuits. To address this issue, we propose an approach based on a planar inverse split-ring resonator (ISRR) loaded with a thin Permalloy (Py) film and exploiting the photon-magnon coherent coupling effect. Our numerical studies show that the ISRR-based antenna achieves more than a fourfold improvement in conversion efficiency compared to a conventional single-microstrip-transmission-line antenna when working at frequencies and bias magnetic fields around the anticrossing frequency gap. This has been demonstrated in the weak photon-magnon coherent coupling regime for a nanometer-thin Py film with micrometer lateral dimensions. Further optimization of the ISRR can help to achieve the strong coherent coupling regime, making the system potentially useful for quantum technology. Our compact and efficient antenna design offers a significant advantage over standard microstrip-line antennas, paving the way for powerful magnonic circuits for microwave signal processing.

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• Magnetic coupling
• Magneto-optics
• Magnons
• Spin dynamics
• Spin optoelectronics
• Spin waves
• Transducers
• Microwave techniques