Magnetic properties of nanorods of NiO (diameter ≈5nm and average aspect ratio ≈12), with and without oleic acid coating, are reported. Temperature variations (5 to 300 K) of the magnetization and electron magnetic resonance (EMR) spectra were measured to determine the respective blocking temperatures Tb(m) and Tb(EMR). The following differences are noted: (1) Tb(m) is reduced from 230 K (uncoated) to 85 K (coated) for H=25Oe(2.5mT); (2) Decrease of Tb(m) with H is weaker and the ratio Tb(EMR)∕Tb(m) is smaller for the uncoated particles. These differences are due to stronger interparticle interaction present in the uncoated particles.
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Seehra et al. (2005) studied this question.
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