# Influence of the Dzyaloshinskii-Moriya interaction on the FMR spectrum of magnonic crystals and confined structures

## TL;DR

This paper investigates how surface-induced Dzyaloshinskii-Moriya interaction (DMI) influences the ferromagnetic resonance spectrum in magnonic crystals and confined structures, revealing increased absorption peaks and frequency shifts.

## Contribution

It introduces a detailed analysis of DMI effects on FMR spectra in magnonic structures and proposes a method to estimate DMI strength from FMR measurements.

## Key findings

- DMI significantly enhances absorption peak intensity.
- DMI causes frequency shifts in quantized modes.
- Proposed structures enable DMI strength estimation.

## Abstract

We study the effect of surface-induced Dzyaloshinskii-Moriya interaction (DMI) on the ferromagnetic resonance (FMR) spectrum of thickness-modulated one-dimensional magnonic crystals and isolated stripes. The DMI is found to substantially increases the intensity of absorption peaks and shifts the frequencies of the laterally quantized modes. The role of the DMI is determined by analyzing the amplitude and phase distributions of dynamic magnetic excitations calculated with frequency- and time-domain calculation methods. We propose experimentally realizable magnonic crystals and confined structures with multiple FMR absorption peaks. The frequency or magnetic field separation between FMR lines is exploited to propose a method for estimation of the DMI strength.