Topological spin/structure couplings in layered chiral magnet Cr1/3TaS2: The discovery of spiral magnetic superstructure

Kai Du, Fei Ting Huang, Jaewook Kim, Seong Joon Lim, Kasun Gamage, Junjie Yang, Maxim Mostovoy, Joseph Garlow, Myung Geun Han, Yimei Zhu, Sang Wook Cheong

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Chiral magnets have recently emerged as hosts for topological spin textures and related transport phenomena, which can find use in next-generation spintronic devices. The coupling between structural chirality and noncollinear magnetism is crucial for the stabilization of complex spin structures such as magnetic skyrmions. Most studies have been focused on the physical properties in homochiral states favored by crystal growth and the absence of long-ranged interactions between domains of opposite chirality. Therefore, effects of the high density of chiral domains and domain boundaries on magnetic states have been rarely explored so far. Herein, we report layered heterochiral Cr1/3TaS2, exhibiting numerous chiral domains forming topological defects and a nanometer-scale helimagnetic order interlocked with the structural chirality. Tuning the chiral domain density, we discovered a macroscopic topological magnetic texture inside each chiral domain that has an appearance of a spiral magnetic superstructure composed of quasiperiodic Néel domain walls. The spirality of this object can have either sign and is decoupled from the structural chirality. In weak, in-plane magnetic fields, it transforms into a nonspiral array of concentric ring domains. Numerical simulations suggest that this magnetic superstructure is stabilized by strains in the heterochiral state favoring noncollinear spins. Our results unveil topological structure/spin couplings in a wide range of different length scales and highly tunable spin textures in heterochiral magnets.

Original languageEnglish (US)
Article numbere2023337118
JournalProceedings of the National Academy of Sciences of the United States of America
Volume118
Issue number40
DOIs
StatePublished - Oct 5 2021

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • Cycloidal magnetic solitons
  • Intercalated transition metal dichalcogenides
  • Layered chiral magnet
  • Magnetoelastic coupling
  • Topological heterochiral state

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