Magnetic anisotropy and chirality of frustrated Cr nanostructures on Au(1 1 1)

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

By using a fully relativistic embedded cluster Green's function technique we investigated the magnetic anisotropy properties of four different compact Cr trimers (equilateral triangles) and Cr mono-layers deposited on the Au(1 1 1) surface in both fcc and hcp stackings. For all trimers the magnetic ground state was found to be a frustrated 120 Néel configuration. Applying global spin rotations to the magnetic ground state, predictions of an appropriate second order spin Hamiltonian were reproduced with high accuracy by first principles calculations. For the Cr trimers with adjacent Au atoms in similar geometry, we obtained similar values for the in-plane and out-of-plane anisotropy parameters, however, the Dzyaloshinskii-Moriya (DM) interactions appeared to differ remarkably. For two kinds of trimers we found an unconventional magnetic ground state showing 90 in-the-plane rotation with respect to the high symmetry directions. Due to higher symmetry, the in-plane anisotropy term was missing for the mono-layers and distinctly different DM interactions were obtained for the different stackings. The chiral degeneracy of the Néel configurations was lifted by an energy less than 2meV for the trimers, while this value increased up to about 15meV per 3Cr atoms for the hcp packed mono-layer.

Original languageEnglish
Article number436001
JournalJournal of Physics Condensed Matter
Volume26
Issue number43
DOIs
Publication statusPublished - Oct 29 2014

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Chirality
Magnetic anisotropy
trimers
chirality
Ground state
Nanostructures
anisotropy
Anisotropy
Hamiltonians
Atoms
ground state
Green's function
symmetry
configurations
Geometry
triangles
atoms
Green's functions
interactions
geometry

Keywords

  • antiferromagnetism
  • Au(1 1 1)
  • chirality
  • Cr
  • frustration
  • magnetic anisotropy
  • triangular lattice

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Magnetic anisotropy and chirality of frustrated Cr nanostructures on Au(1 1 1). / Balogh, L.; Udvardi, L.; Szunyogh, L.

In: Journal of Physics Condensed Matter, Vol. 26, No. 43, 436001, 29.10.2014.

Research output: Contribution to journalArticle

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