Magnetic droplet nucleation with homochiral Neel domain wall

TL;DR

This paper presents an extended droplet model and experimental validation for understanding how Dzyaloshinskii Moriya interaction influences magnetic domain nucleation in thin films, with a focus on practical measurement techniques.

Contribution

It introduces a new extended droplet model incorporating DMI effects and demonstrates its effectiveness through experiments and simulations for quantifying DMI energy density.

Findings

The model accurately predicts nucleation fields in DMI-influenced thin films.

Experimental results align with micromagnetic simulations.

Proposed electrical measurement method enables quantitative DMI energy density determination.

Abstract

We investigate the effect of the Dzyaloshinskii Moriya interaction (DMI) on magnetic domain nucleation in a ferromagnetic thin film with perpendicular magnetic anisotropy. We propose an extended droplet model to determine the nucleation field as a function of the in-plane field. The model can explain the experimentally observed nucleation in a CoNi microstrip with the interfacial DMI. The results are also reproduced by micromagnetic simulation based on the string model. The electrical measurement method proposed in this study can be widely used to quantitatively determine the DMI energy density.