Conference Publication Details
Mandatory Fields
Godsell, JF;Donegan, KP;Tobin, JM;Copley, MP;Rhen, FMF;Otway, DJ;Morris, MA;O'Donnell, T;Holmes, JD;Roy, S
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Magnetic properties of Ni nanoparticles on microporous silica spheres
2010
May
Validated
1
WOS: 12 ()
Optional Fields
IRON NANOPARTICLES PARTICLES MICROSPHERES TEMPERATURE FABRICATION ALLOYS FILMS FE
1269
1274
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.
10.1016/j.jmmm.2009.06.075
Grant Details