Anomalous magnetic behavior of CuO nanoparticles

We report studies on temperature, field and time dependence of magnetization on cupric oxide nanoparticles of sizes 9 nm, 13 nm and 16 nm. The nanoparticles show unusual features in comparison to other antiferromagnetic nanoparticle systems. The field cooled (FC) and zero field cooled (ZFC) magnetiz...

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Bibliographic Details
Published in:Solid state communications 2010-05, Vol.150 (17), p.884-887
Main Authors: Bisht, Vijay, Rajeev, K.P., Banerjee, Sangam
Format: Article
Language:English
Subjects:
A. CuO nanoparticles
Antiferromagnetism
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER OXIDE
Cross-disciplinary physics: materials science
rheology
CUPRIC OXIDE
D. Magnetic relaxation
D. Memory effects
D. Spin glass
Exact sciences and technology
GLASSES
MAGNETIC PROPERTIES
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetization
Magnetization curves
Materials science
Nanoparticles
Nanopowders
Nanoscale materials and structures: fabrication and characterization
OXIDES
PARTICLES
Physics
Solid state
SOLID STATE PHYSICS
Spin glass
Time dependence
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Summary:We report studies on temperature, field and time dependence of magnetization on cupric oxide nanoparticles of sizes 9 nm, 13 nm and 16 nm. The nanoparticles show unusual features in comparison to other antiferromagnetic nanoparticle systems. The field cooled (FC) and zero field cooled (ZFC) magnetization curves bifurcate well above the Néel temperature and the usual peak in the ZFC magnetization curve is absent. The system does not show any memory effects which is in sharp contrast to the usual behavior shown by other antiferromagnetic nanoparticles. It turns out that the non-equilibrium behavior of CuO nanoparticles is very strange and is neither superparamagnetic nor spin glass like.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2010.01.048