Abstract
Exploring a low-power method for exciting terahertz (THz) signals is of great interest in developing devices with ultrafast signal processing. We numerically investigated the THz magnon excitation from a moving antiferromagnetic (AFM) domain wall (DW) driven by a voltage-induced magnetic anisotropy energy gradient (dEa/dx). This magnon excitation originates from the DW precession induced by dEa/dx. Unlike the AFM DW precession triggered by DW acceleration as predicted in previous investigation, the dEa/dx-induced DW precession is possible when the DW acceleration is negligible. When the frequency of DW precession is greater than the frequency gap of spin-wave propagation in the AFM medium, THz magnons are resonantly excited. Because dEa/dx can be generated under a moderate DC voltage, our work provides a potential approach for developing THz spintronic devices with a low power and dissipation.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call