Phononic Crystal Cavity Magnomechanics

Phononic crystal (PnC) enables strong confinement of phonons in a wavelength-scale tiny area due to a band gap, which can enhance the interaction with different physical systems. Here, we utilize the PnC to demonstrate local manipulations of magnons by using ultrahigh frequency phonons confined in a phononic cavity, where the tiny and low-loss vibrations excite magnons in a micromagnet via mag-netostriction. Moreover, we find that the magnetoelastic interaction is modulated by selectively exciting the cavity resonant modes. The results open up a realm of PnC cavity magnomechanics and will provide universal controls of ultrahigh frequency magnons and phonons with PnC circuits.

Automated summary

Phononic crystals (PnC) can confine phonons in a small area due to a band gap, enhancing their interaction with different systems. In this study, PnC is used to manipulate magnons via ultrahigh frequency phonons confined in a phononic cavity, exciting magnons in a micromagnet through magnetostriction. Furthermore, the magnetoelastic interaction is modulated by selectively exciting cavity resonant modes. These results open up new possibilities for PnC cavity magnomechanics and universal controls of ultrahigh frequency magnons and phonons with PnC circuits.