Journal ArticleDOI
Magnetic Structure of Cobalt Manganite by Neutron Diffraction
B. Boucher,R. Buhl,M. Perrin +2 more
TLDR
In this article, the magnetic moment of pure iron manganite FeMn2O4 was measured at 4.2°K and showed that the inversion parameter is 0.91 (nearly inverse spinel).Abstract:
Pure iron manganite FeMn2O4 was prepared at 1250°C and quenched. It crystallizes in the b.c. tetragonal system D4h19. Neutron diffraction measurements above the Curie temperature (120°C) show that the inversion parameter is 0.91 (nearly inverse spinel). The spontaneous magnetization at 4.2°K measured in high static and pulsed fields is 1.55 μB/mol. The magnetic moment was observed to increase linearly above 70 kOe and showed the presence of a strong anisotropy with easy axis near the [101] direction (unusual fact). Neutron diffraction measurements at 4.2°K lead to the determination of the magnetic structure of FeMn2O4. The tetrahedral sublattice moments (4.3 μB) are collinear in a (010) plane making an angle of − 172° with Ox [100]. Spins in octahedral sites (3.1 μB) are divided into four magnetic sublattices with a pyramidal arrangement whose axis of symmetry lies in the plane (010) and makes an angle of 14° with Ox [100]. At 55°K the spins of the octahedral sublattices become collinear, the easy magneti...read more
Citations
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Journal ArticleDOI
Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions
Prashanth W. Menezes,Arindam Indra,Nastaran Ranjbar Sahraie,Arno Bergmann,Peter Strasser,Matthias Driess +5 more
TL;DR: The oxygen reduction activity and stability of the tetragonal CoMn2 O4 catalyst outperformed that of cubic MnCo 2 O4 and rivals that of benchmark Pt catalysts.
Journal ArticleDOI
Strongly exchange coupled inverse ferrimagnetic soft/hard, mnxfe3 xo4/fexmn3 xo4, core/shell heterostructured nanoparticles
Alberto López-Ortega,M. Estrader,M. Estrader,German Salazar-Alvarez,Sònia Estradé,I. V. Golosovsky,Randy K. Dumas,David Keavney,M. Vasilakaki,Kalliopi N. Trohidou,Jordi Sort,Jordi Sort,Francesca Peiró,Santiago Suriñach,Maria Dolors Baró,Josep Nogués,Josep Nogués +16 more
TL;DR: The results indicate that, similar to thin film systems, the magnetic properties of soft/hard core/shell nanoparticles can be fine tuned to match specific applications.
Journal ArticleDOI
Cation migration, cation valencies and the cubic-tetragonal transition in MnxFe3−xO4
TL;DR: In this article, the experimental data are interpreted in terms of two cation migration processes, namely the cation exchange between the octahedral and tetrahedral sublattices, and an octagonal Mn 3+ clustering.
Journal ArticleDOI
CoMn2O4 spinel from a MOF: synthesis, structure and magnetic studies
TL;DR: In this paper, a mixed metal MOF compound, CoMn2(C6H3(COO)(3))(2)], is shown to have a canted anti-ferromagnetic behavior due to the large antisymmetric DM interaction between the M2+ ions (M = Mn, Co).
Journal ArticleDOI
Valence states and occupation sites in (Fe, Mn)(3)O-4 spinel oxides investigated by soft x-ray absorption spectroscopy and magnetic circular dichroism
Hyo-Jeong Lee,Goo-Young Kim,D. H. Kim,J.-S. Kang,Chenglin Zhang,Sang-Wook Cheong,Jeonghyun Shim,Soonchil Lee,Hangil Lee,J. Y. Kim,B. Kim,B. I. Min +11 more
TL;DR: In this article, the electronic structures of (Fe,Mn)3O4 spinel oxides have been investigated by employing soft-x-ray absorption spectroscopy and soft x-ray magnetic circular dichroism (XMCD).
References
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Journal ArticleDOI
Antiferromagnetic Arrangements in Ferrites
TL;DR: In this paper, the antiferromagnetic exchange interactions within the two magnetic sublattices are considered and the ground state may have an antiparallel arrangement of the spins on the two sites.
Journal ArticleDOI
Evidence for triangular moment arrangements in MO · Mn2O3
TL;DR: In this article, the spontaneous moment of a compound of the form MO · Mn2O3 was found to be 1.56 ± 0.04 Bohr magnetons/molecule, with the B-site moments sub-divided into groups at angles.
Journal ArticleDOI
Mössbauer Effect in Mn x Fe 3-x O 4
TL;DR: In this article, an analysis of the Mossbauer effect of Fe/sup 57/ on several specimens of the Mn/sub x/Fe/sub 3/-/sub X/O/sub 4/ system and a CuFe/su b 2 /O/ sub 4/ sample was made.