Nonlinear harmonics in thin magnetic films with interfacial Dzyaloshinskii-Moriya interactions
Phys. Rev. B 113, 104421 – Published 12 March, 2026
DOI: https://doi.org/10.1103/41yy-6dmk
Abstract
We study the effect of the Dzyaloshinskii-Moriya interaction (DMI) on the nonlinear creation of spin-wave harmonics. We analyze the Landau-Lifshitz equations, numerically and analytically, for a narrow Permalloy stripe with interfacial DMI. If the static field is perpendicular to the stripe, spin waves traveling in one direction can have harmonics that are more than 50 times larger than that for the waves moving oppositely. When the external field is parallel to the stripe and the DMI is present, both even and odd harmonics are generated; without the DMI, only odd harmonics appear. This potentially offers a different way to measure the DMI strength. In systems with larger nonlinearity, through an increased driving field or a different choice of driving frequency, frequency combs can appear.
