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

Magnetic ordering in the rutile molecular magnets M^II[N(CN)₂]₂ (M = Ni, Co, Fe, Mn, Ni_0.5Co_0.5, and Ni_0.5Fe_0.5)

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

Advanced Institute for Materials Research (AIMR)

Research output: Contribution to journal › Article › peer-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, M^II[N(CN)₂]₂ where M = Ni, Co, Fe, Mn, Ni_0.5Co_0.5, and Ni_0.5Fe_0.5. 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 Ni_0.5Co_0.5 displays the same collinear ferromagnetic structure as its parent compounds. However, the composition with M = Ni_0.5Fe_0.5, 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

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Magnetic ordering in the rutile molecular magnets M^II[N(CN)₂]₂ (M = Ni, Co, Fe, Mn, Ni_0.5Co_0.5, and Ni_0.5Fe_0.5). / Lappas, Alexandros; Wills, Andrew S.; Green, Mark A.; Prassides, Kosmas; Kurmoo, Mohamedally.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 67, No. 14, 144406, 04.2003, p. 1444061-1444068.

Research output: Contribution to journal › Article › peer-review

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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.",

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N2 - 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.

AB - 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.

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Magnetic ordering in the rutile molecular magnets M^II[N(CN)₂]₂ (M = Ni, Co, Fe, Mn, Ni_0.5Co_0.5, and Ni_0.5Fe_0.5)

Abstract

ASJC Scopus subject areas

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