Strain Modulation of Magnonic Frequency Comb by Magnon–Skyrmion Interaction in Ferromagnetic Materials

Abstract

The magnonic frequency comb (MFC) induced by magnon–skyrmion interaction not only exhibits interesting nonlinear physics but also can be used to detect magnetic solitons and defects in ferromagnetic materials. Modulating the tooth spacing of MFC is crucial for its application in magnon‐based devices. Herein, it is demonstrated from micromagnetic simulations that the MFC tooth spacing of ferromagnetic thin film can be effectively modulated by a biaxial in‐plane strain via magnetoelastic coupling. It is found that the MFC tooth spacing increases with the increase of compressive strain and decreases with the increase of tensile strain. The strain modulation of MFC tooth spacing stems from the strain‐dependent magnetocrystalline anisotropy. The detailed energy analysis shows that the larger the tooth spacing is, the higher the exchange energy is, and the lower the magnetoelastic and anisotropy energies are. In addition, when the biaxial in‐plane strain becomes nonequally axial (or anisotropic), the tooth spacing becomes smaller, accompanied by a decrease in the magnetoelastic energy. The results of this study suggest an effective way to modulate the tooth spacing of MFC by strain, which may hold a promise for application in tunable magnon‐based devices.