Magnetic ordering in the rutile molecular magnets MII[N(CN)2]2 (M = Ni, Co, Fe, Mn, Ni0.5Co0.5, and Ni0.5Fe0.5)

Alexandros Lappas, Andrew S. Wills, Mark A. Green, Kosmas Prassides, Mohamedally Kurmoo

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Rietveld refinement of powder neutron diffraction data, combined with group theory considerations, is used to determine the magnetic structures of the binary metal dicyanamide, MII[N(CN)2]2 where M = Ni, Co, Fe, Mn, Ni0.5Co0.5, and Ni0.5Fe0.5. Compounds with M = Mn or Fe show a canted antiferromagnetic arrangement of spin oriented in the ab crystallographic plane, with antiparallel components of the two sublattices along the a axis and parallel along the b axis. Symmetry considerations forbid an additional moment, whether compensated or not, to be present along the c axis. The compounds with fewer unpaired electrons (Co and Ni) are ferromagnets, with all moments oriented along the c axis. The mixed composition of Ni0.5Co0.5 displays the same collinear ferromagnetic structure as its parent compounds. However, the composition with M = Ni0.5Fe0.5, whose parent compounds show different magnetic behavior, does not exhibit long-range magnetic ordering down to 1.7 K. Magnetostriction was observed for the ferromagnets for which we investigated the variable temperature powder neutron diffraction. The cobalt-rich compounds show more pronounced effects, consistent with their increasing magnetocrystalline anisotropy.

Original languageEnglish
Article number144406
Pages (from-to)1444061-1444068
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number14
Publication statusPublished - 2003 Apr

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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