Coupling of magnon modes in nanodisk with spin texture

Magnetic nanostructures with nonhomogeneous magnetic properties exhibit distinct magnon modes, and their interactions are crucial for understanding magnetization dynamics. In this work, we numerically investigate the magnon–magnon coupling in a nanodisk with radially varying magnetic anisotropy by using micromagnetic simulations. By introducing perpendicular magnetic anisotropy into the inner region of the nanodisk, a radially chiral spin texture is observed. The presence of the chiral spin texture results in coupling between the ferromagnetic resonance mode of the whole disk and the higher-order confined modes in the outer region. Moreover, we find that the coupling strength is highly sensitive to the perpendicular magnetic anisotropy, the saturation magnetization, and the interfacial Dzyaloshinskii–Moriya interaction. Our findings could enrich the understanding of the dynamic characteristics of chiral nanomagnets and suggest a possible route to harnessing tunable magnon–magnon coupling for spin-based quantum information processing.