Modeling the Effect of Magnon-Phonon Interaction on Radiated Efficiency of Magneto-acoustic Antenna

To further optimize the design, the radiated power of one-dimensional magneto-acoustic antenna with magnonphonon interaction is derived. the dynamic, magneto-elastic component of the antenna is introduced by model of the magnetic material layer’s free enthalpy density, and the magneto-elastic coupling links the time dependent lattice strain tensor $\varepsilon$ to the magnetic environment. According to vibrational modes of surface acoustic waves and the magnetoelastic driving field, the energy absorption expression of the ferromagnetic resonance driven by surface acoustic waves is established by solving the effective magnetic field and the simple harmonic vibrational mechanical energy equation simultaneously. The effect of magnon-phonon interaction on radiation performance of magneto-acoustic antenna is studied, and the change of radiated efficiency with the increase of bias magnetic field is explored.