Observation of domain wall bimerons in chiral magnets

Tomoki Nagase (), Yeong-Gi So, Hayata Yasui, Takafumi Ishida, Hiroyuki K. Yoshida, Yukio Tanaka, Koh Saitoh, Nobuyuki Ikarashi, Yuki Kawaguchi, Makoto Kuwahara () and Masahiro Nagao ()
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Tomoki Nagase: Nagoya University
Yeong-Gi So: Akita University
Hayata Yasui: Akita University
Takafumi Ishida: Nagoya University
Hiroyuki K. Yoshida: Hokkaido University
Yukio Tanaka: Nagoya University
Koh Saitoh: Nagoya University
Nobuyuki Ikarashi: Nagoya University
Yuki Kawaguchi: Nagoya University
Makoto Kuwahara: Nagoya University
Masahiro Nagao: Nagoya University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-23845-y

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