Determination of magnetic domain-wall types using Dzyaloshinskii–Moriya-interaction-induced domain patterns

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  • Dae-Yun Kim
    Seoul National University Department of Physics and Institute of Applied Physics, , Seoul 151-742, South Korea
  • Duck-Ho Kim
    Seoul National University Department of Physics and Institute of Applied Physics, , Seoul 151-742, South Korea
  • Joon Moon
    Seoul National University Department of Physics and Institute of Applied Physics, , Seoul 151-742, South Korea
  • Sug-Bong Choe
    Seoul National University Department of Physics and Institute of Applied Physics, , Seoul 151-742, South Korea

Abstract

<jats:p>The Néel-type domain-wall (DW) configuration caused by the Dzyaloshinskii–Moriya interaction has attracted significant attention because of its crucial role in current-induced DW motion. Here, we propose an experimental technique to determine the DW types (Néel or Bloch) by analyzing the asymmetry in domain expansion patterns. Such asymmetry is caused by the counterbalance between the Dzyaloshinskii–Moriya and Zeeman interactions, which results in the elongation of the domains either longitudinal (for Néel-type DWs) or transverse (for Bloch-type DWs) to the in-plane magnetic field. Therefore, the DW types can be determined simply by examining the elongation axis. The present technique is applicable even to a single image of the domain expansion pattern and provides a rapid determination of the DW configuration for exploring high-efficiency materials for current-induced DW motion in device applications.</jats:p>

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