Spin-Cherenkov effect in a magnetic nanostrip with interfacial Dzyaloshinskii-Moriya interaction

摘要: Spin-Cherenkov effect enables strong excitations of spin waves (SWs) with nonlinear wave dispersions. The Dzyaloshinskii-Moriya interaction (DMI) results in anisotropy and nonreciprocity SWs propagation. In this work, we study the interfacial DMI on SW Cherenkov permalloy thin-film strips within framework micromagnetism. By performing micromagnetic simulations, it is shown that coherent are excited when velocity a moving magnetic source exceeds propagation SWs. Moreover, threshold finite can be reduced compared to case zero DMI. It thereby provides promising route towards efficient generation propagation, potential applications spintronic magnonic devices.