Generic role of the Dzyaloshinskii-Moriya interaction in nanocrystalline ferromagnets

TL;DR

This study uses numerical micromagnetic simulations to explore how interfacial Dzyaloshinskii-Moriya interaction influences spin configurations and magnetic properties in nanocrystalline terbium, revealing its role in experimental neutron scattering patterns.

Contribution

It provides a detailed numerical analysis of interfacial DMI effects in nanocrystalline ferromagnets, linking microscopic interactions to macroscopic magnetic behavior.

Findings

DMI causes spin misalignment between nanograins.

DMI leads to asymmetric patterns in neutron scattering.

DMI impacts overall magnetic parameters of polycrystalline materials.

Abstract

Motivated by recent experimental polarized neutron results, we present a numerical micromagnetic study of the interfacial (intergrain) Dzyaloshinskii-Moriya interaction (DMI) in nanocrystalline terbium. We demonstrate that the DMI-induced spin misalignment between adjacent nanograins is the reason for the formation of the asymmetric positive-negative pattern seen in polarized neutron scattering experiments. Analysis of the remagnetization process suggests the generic impact of the DMI on the macroscopic magnetic parameters of polycrystalline defect-rich materials.