The European Physical Journal D 1999
DOI: 10.1007/978-3-642-88188-6_95
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Magnetic properties of CoO nanoparticles

Abstract: Abstract. The magnetic circular X-ray dichroism (MCXD) of CoO nanoparticles was measured at low temperatures and in high magnetic fields. The particles show a superparamagnetic behaviour at room temperature, and a large orbital contribution to the magnetic moment at low temperatures was observed. This enhancement of orbital magnetism is largely determined by the contribution of the surface atoms. The larger spin-orbit coupling of the electrons of the surface atoms of the particle can cause a change in magnetic… Show more

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Cited by 8 publications
(8 citation statements)
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“…Others have also observed this fluorescent peak at both the ALS and European Synchrotron Radiation Facility and previously assigned it as originating from charge transfer satellites or cobalt-acetate residues. 17,38 Recent experiments show this peak also appears prominently in systems with no cobalt, ruling out a cobaltsample related assignment. For thin film Co 3 O 4 , the contribution of T d Co 2+ to the simulation, when included with a stoichiometric ratio of Co 2+ to Co 3+ , is smaller than suggested by experiment.…”
Section: ■ Results and Discussionmentioning
confidence: 98%
“…Others have also observed this fluorescent peak at both the ALS and European Synchrotron Radiation Facility and previously assigned it as originating from charge transfer satellites or cobalt-acetate residues. 17,38 Recent experiments show this peak also appears prominently in systems with no cobalt, ruling out a cobaltsample related assignment. For thin film Co 3 O 4 , the contribution of T d Co 2+ to the simulation, when included with a stoichiometric ratio of Co 2+ to Co 3+ , is smaller than suggested by experiment.…”
Section: ■ Results and Discussionmentioning
confidence: 98%
“…With respect to the research about magnetic properties of cubic CoO nanoparticles, they are conflicting. Flipse et al have found that the large spin–orbit coupling of the electrons of the surface atoms can cause a change in magnetic ordering in the core of the CoO particles, while the ferromagnetic interaction in the small CoO nanoparticles (<16 nm) at low temperatures is observed by Ghosh et al In addition, there are some reports on the observation of room temperature ferromagnetism in cubic CoO nanoparticles. , On the other hand, with the development of nanotechnology, hexagonal CoO nanocrystals have also been synthesized. Their thermodynamic properties and phase transformation from cubic to hexagonal are reported. ,, However, there is little work on the comprehensive characterization of the optical and magnetic behaviors of hexagonal CoO nanoparticles.…”
Section: Introductionmentioning
confidence: 99%
“…they are conflicting. Flipse et al have found that the large spin−orbit coupling of the electrons of the surface atoms can cause a change in magnetic ordering in the core of the CoO particles,23 while the ferromagnetic h i b i t e d .…”
mentioning
confidence: 99%
“…Similar to Co 3 O 4 , ZnCo 2 O 4 has also been investigated as a battery anode and catalyst, as well as a pigment and a hole transport layer for organic photovoltaic cells/ p ‐type buffer layer for inorganic cells . The high‐temperature CoO end‐member, which is also p ‐type and antiferromagnetic, serves in glaze and enamel pigments and has been researched for its size‐dependent magnetic properties . A variety of crystal structures are present—in bulk form, ZnO takes the hexagonal wurtzite structure (space group P 6 3 mc ); Co 3 O 4 and ZnCo 2 O 4 are both “normal” spinels with the 3+ ions mostly on octahedral sites and the 2+ ions mostly on tetrahedral sites (space group Fd 3¯ m ); the high‐temperature cobalt oxide, CoO, has the rocksalt structure (space group Fm 3¯ m ).…”
Section: Introductionmentioning
confidence: 99%