First principles calculation of magnetic order in a low-temperature phase of the iron ludwigite

M. Matos*, J. Terra, D. E. Ellis, A. S. Pimentel

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The magnetic order of a low-temperature dimerized phase of Fe 3O2BO3 is investigated through a density functional approach which considers full non-collinear spin-spin interactions, focusing on the 15 K crystalline structure. It is found that Fe spins in the (Fe-Fe)5+ dimer, formed during the room temperature structural change of Fe3O2BO3, are parallel and have little freedom to rotate under interaction with neighbor Fe atoms. While the Fe dimer behaves as a heavy single magnetic unit the spin magnetic moment of the third Fe3+ atom of the Fe triad has, on the contrary, much more freedom to rotate. This is responsible for a canted spin ordering, revealed by a rotation of ~80° of the trivalent Fe spin relative to the spin orientation of the dimer, due to spin-spin interaction with divalent Fe atoms outside the triad. Canting is thus seen to be responsible for the very low net magnetization, experimentally observed in this compound (T<40 K).

Original languageEnglish (US)
Pages (from-to)148-152
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume374
DOIs
StatePublished - Jan 15 2015

Keywords

  • DFT
  • Fe ludwigite
  • Magnetic order
  • Non-collinear spin
  • Theory

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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