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 language | English |
---|---|
Article number | 144406 |
Pages (from-to) | 1444061-1444068 |
Number of pages | 8 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 67 |
Issue number | 14 |
Publication status | Published - 2003 Apr |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics