Chirality-Induced Noncollinear Magnetization and Asymmetric Domain-Wall Propagation in Hydrogenated CoPd Thin Films

Wei Hsiang Wang, Ching Yang Pan, Chak Ming Liu, Wen Chin Lin*, Pei Hsun Jiang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Array-patterned CoPd-based heterostructures are created through e-beam lithography and plasma pretreatment that induces oxidation with depth gradient in the CoPd alloy films, breaking the central symmetry of the structure. Effects on the magnetic properties of the follow-up hydrogenation of the thin film are observed via magneto-optic Kerr effect microscopy. The system exhibits a strong vertical and lateral antiferromagnetic coupling in the perpendicular component between the areas with and without plasma pretreatment, and asymmetric domain-wall propagation in the plasma-pretreated areas during magnetization reversal. These phenomena exhibit evident magnetic chirality and can be interpreted with the Ruderman-Kittel-Kasuya-Yosida coupling and the Dzyaloshinskii-Moriya interaction (DMI). The sample processing demonstrated in this study allows easy incorporation of lithography techniques that can define areas with or without DMI to create intricate magnetic patterns on the sample, which provides an avenue toward more sophisticated control of canted spin textures in future spintronic devices.

Original languageEnglish
Pages (from-to)20151-20158
Number of pages8
JournalACS Applied Materials and Interfaces
Volume14
Issue number17
DOIs
Publication statusPublished - 2022 May 4

Keywords

  • Dzyaloshinskii-Moriya interaction
  • hydrogenation
  • magnetic patterning
  • magneto-optic Kerr effect microscopy
  • thin films

ASJC Scopus subject areas

  • General Materials Science

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