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Size dependence of the magnetic properties of Ni nanoparticles prepared by thermal decomposition method
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Size dependence of the magnetic properties of Ni nanoparticles prepared by thermal decomposition method
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Journal Article
Size dependence of the magnetic properties of Ni nanoparticles prepared by thermal decomposition method
2013
Overview
By means of thermal decomposition, we prepared single-phase spherical Ni nanoparticles (23 to 114 nm in diameter) that are face-centered cubic in structure. The magnetic properties of the Ni nanoparticles were experimentally as well as theoretically investigated as a function of particle size. By means of thermogravimetric/differential thermal analysis, the Curie temperature
T
C
of the 23-, 45-, 80-, and 114-nm Ni particles was found to be 335°C, 346°C, 351°C, and 354°C, respectively. Based on the size-and-shape dependence model of cohesive energy, a theoretical model is proposed to explain the size dependence of
T
C
. The measurement of magnetic hysteresis loop reveals that the saturation magnetization
M
S
and remanent magnetization increase and the coercivity decreases monotonously with increasing particle size, indicating a distinct size effect. By adopting a simplified theoretical model, we obtained
M
S
values that are in good agreement with the experimental ones. Furthermore, with increase of surface-to-volume ratio of Ni nanoparticles due to decrease of particle size, there is increase of the percentage of magnetically inactive layer.
Publisher
Springer New York,Springer
