Chiral domain wall dynamics in magnetic heterostructures with bulk Dzyaloshinskii-Moriya interactions

Abstract

In this work, dynamics of chiral domain walls in long and narrow magnetic heterostructures based on non-centrosymmetric chiral magnets with bulk Dzyaloshinskii-Moriya interactions (DMI) and perpendicular magnetic anisotropy is systematically investigated. The driving forces can be out-of-plane magnetic fields and in-plane currents, correspondingly both steady and precessional flows are considered. Their dividing points (the Walker critical field and current density) are obtained as functions of bulk DMI strength ($D_{\mathrm{b}}$) and the ratio ($\kappa$) of total (crystalline plus shape) anisotropy in the hard axis over that in the easy one. When far beyond Walker breakdown, the dependence curve of wall velocity on external in-plane bias field takes parabolic shape around the compensation point where the total in-plane field disappears. The center shift is determined by $D_{\mathrm{b}}$, $\kappa$, and the wall's topological charge, thus can be used to measure the bulk DMI strength in chiral magnets.

9 pages, 4 figures

References in corpus (6)

• Skyrmions in Magnetic Multilayers
• Skyrmion fractionalization and merons in chiral magnets with easy-plane anisotropy
• Compact Skyrmions, Merons and Bimerons in Thin Chiral Magnetic Films
• Magnonic frequency comb through nonlinear magnon-skyrmion scattering
• Large Noncollinearity and Spin Reorientation in the Novel Mn2RhSn Heusler Magnet
• Tuning domain wall velocity with Dzyaloshinskii-Moriya interaction