Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 9-12, Pages 1269-1274Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.06.075
Keywords
Microporous silica sphere; Magnetic nanocomposite; Ni nanoparticle; Silica sphere; Superparamagnetism
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Ni nanoparticles (similar to 32 nm particle diameter) have been synthesized on the walls of microporous (similar to 1 nm pore diameter) silica spheres (similar to 2.6 mu m sphere diameter) and characterised magnetically to potentially produce a new class of core (silica micro-spheres)-shell (nanometallic)-type nanocomposite material. These magnetic nanocomposite materials display a characteristic increase in coercivity with reducing temperature. The average particle size has been used to calculate the anisotropy constant for the system, K. The discussion postulates the potential mechanisms contributing to the difference between the calculated K value and the magnetocrystalline anisotropy constant of bulk Ni. Various factors such as surface anisotropy and interparticle interactions are discussed as possible contributing factors to the anisotropy values calculated in the paper. (C) 2009 Elsevier B.V. All rights reserved.
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