Magnon transport in the presence of antisymmetric exchange in a weak antiferromagnet

A. Ross, R. Lebrun, O. Gomonay, J. Sinova, A. Kay, D. A. Grave, A. Rothschild, M. Kläui

Research output: Contribution to journalArticlepeer-review

Abstract

The Dzyaloshinskii-Moriya interaction (DMI) is at the heart of many modern developments in the research field of spintronics. DMI is known to generate noncollinear magnetic textures, and can take two forms in antiferromagnets: homogeneous or inter-sublattice, leading to small, canted moments and inhomogeneous or intra-sublattice, leading to formation of chiral structures. In this work, we first determine the strength of the effective field created by the DMI, using SQUID based magnetometry and transport measurements, in thin films of the antiferromagnetic iron oxide hematite, α-Fe2O3. We demonstrate that DMI additionally introduces reconfigurability in the long distance magnon transport in these films under different orientations of a magnetic field. This arises as a hysteresis centred around the easy-axis direction for an external field rotated in opposing directions whose width decreases with increasing magnetic field as the Zeeman energy competes with the effective field created by the DMI.

Original languageEnglish
Article number168631
JournalJournal of Magnetism and Magnetic Materials
Volume543
DOIs
StatePublished - 1 Feb 2022
Externally publishedYes

Keywords

  • Antiferromagnets
  • Dzyaloshinskii-Moriya Interaction
  • Magnons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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