Abstract
Topological defects embedded in or combined with domain walls have been proposed in various systems, some of which are referred to as domain wall skyrmions or domain wall bimerons. However, the experimental observation of such topological defects remains an ongoing challenge. Here, using Lorentz transmission electron microscopy, we report the experimental discovery of domain wall bimerons in chiral magnet Co-Zn-Mn(110) thin films. By applying a magnetic field, multidomain structures develop, and simultaneously, chained or isolated bimerons arise as the localized state between the domains with the opposite in-plane components of net magnetization. The multidomain formation is attributed to magnetic anisotropy and dipolar interaction, and domain wall bimerons are stabilized by the Dzyaloshinskii-Moriya interaction. In addition, micromagnetic simulations show that domain wall bimerons appear for a wide range of conditions in chiral magnets with cubic magnetic anisotropy. Our results promote further study in various fields of physics.
Highlights
Topological defects embedded in or combined with domain walls have been proposed in various systems, some of which are referred to as domain wall skyrmions or domain wall bimerons
Malozemoff and Slonczewski have discussed the effect of such topological defects on magnetic domain wall (DW) mobility, where the topological defects are Bloch lines that exist as line defects in two-dimensional DWs11
In this study, using Lorentz transmission electron microscopy (LTEM), we report the direct observation of DW bimerons in cubic β-Mn-type chiral magnet Co–Zn– Mn(110) thin films
Summary
Topological defects embedded in or combined with domain walls have been proposed in various systems, some of which are referred to as domain wall skyrmions or domain wall bimerons. Twodimensional magnetic skyrmions have only a short history since the discovery in a chiral magnet[9], they are gaining attention as a platform for studying emergent electromagnetic fields and related physical properties owing to the real-space topology of their spin textures[10]. Their electric current-driven motion at ultralow current density is expected to be exploited in modern efficient spintronic devices. We show the simulated Lorentz transmission electron microscopy (LTEM) images of magnetic skyrmions and conventional DWs as an example.
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