A spin-wave driven skyrmion diode under transverse magnetic fields

A diode, a device allowing unidirectional signal transmission, lies at the heart of modern information technology as a fundamental element of logic operations. Here, we study the motion of the skyrmion driven by the spin wave (SW) in the presence of a transverse magnetic field. We show that the external magnetic field leads to a shift of SW dispersion relation and induces an asymmetric skyrmion propagation when SWs are injected from opposite sides. Based on this finding, we propose the concept of a SW-driven skyrmion diode. We numerically compute the spin-wave transport coefficients to quantify the number of reflected magnons, which explains the skyrmion velocity asymmetry. Our results offer a new insight to design skyrmion devices embracing chiral SWs.