Unusual non-equilibrium behavior of cupric oxide nanoparticles

Details Unusual non-equilibrium behavior of cupric oxide nanoparticles Unusual non-equilibrium behavior of cupric oxide nanoparticles

2009-07-24

arxiv.org/abs/0907.4222v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages,4 figures

Scientific paper

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 Neel 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 nature of CuO nanoparticles is very strange and is neither superparamagnetic nor spin glass-like .

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