Magnetic properties of NiO nanoparticles

Nickel oxide nanoparticles of different sizes are prepared by a sol–gel method. Samples are characterized by X-ray diffraction and transmission electron microscopy. Dc susceptibility measurements as a function of temperature and field are done for various particle sizes. We find peaks in zero field...

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Bibliographic Details
Published in:Thin solid films 2006-05, Vol.505 (1), p.113-117
Main Authors: Tiwari, S.D., Rajeev, K.P.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetization
Materials science
Nanoparticle
Nanopowders
Nanoscale materials and structures: fabrication and characterization
Physics
Superparamagnetism
Susceptibility
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Summary:Nickel oxide nanoparticles of different sizes are prepared by a sol–gel method. Samples are characterized by X-ray diffraction and transmission electron microscopy. Dc susceptibility measurements as a function of temperature and field are done for various particle sizes. We find peaks in zero field cooled susceptibility vs. temperature curves. In sufficiently low fields the peak temperature decreases with increasing particle size whereas at higher fields the peak temperature increases with increasing particle size. We propose that these nanoparticles consist of antiferromagnetically aligned core spins and a spin glass like surface layer.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2005.10.019