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Skyrmion phase and competing magnetic orders on a breathing kagomé lattice. | LitMetric

AI Article Synopsis

  • Magnetic skyrmions are unique magnetic structures typically found in non-centrosymmetric materials, but researchers are exploring their potential in centrosymmetric bulk materials to unlock new properties and functionalities.
  • A new study reports the discovery of a skyrmion lattice (SkL) phase in the metallic compound GdRuAl, characterized by a very small helical pitch of 2.8 nm and significant topological Hall effect.
  • The study employs techniques like resonant x-ray diffraction and Lorentz-transmission electron microscopy to map out the magnetic structures, revealing that the SkL is favored in certain magnetic field conditions due to thermal fluctuations.

Article Abstract

Magnetic skyrmion textures are realized mainly in non-centrosymmetric, e.g. chiral or polar, magnets. Extending the field to centrosymmetric bulk materials is a rewarding challenge, where the released helicity/vorticity degree of freedom and higher skyrmion density result in intriguing new properties and enhanced functionality. We report here on the experimental observation of a skyrmion lattice (SkL) phase with large topological Hall effect and an incommensurate helical pitch as small as 2.8 nm in metallic GdRuAl, which materializes a breathing kagomé lattice of Gadolinium moments. The magnetic structure of several ordered phases, including the SkL, is determined by resonant x-ray diffraction as well as small angle neutron scattering. The SkL and helical phases are also observed directly using Lorentz-transmission electron microscopy. Among several competing phases, the SkL is promoted over a low-temperature transverse conical state by thermal fluctuations in an intermediate range of magnetic fields.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6930224PMC
http://dx.doi.org/10.1038/s41467-019-13675-4DOI Listing

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