Title :
Effect of light on the magnetic properties of cobalt ferrite nanoparticles
Author :
Giri, Anit K. ; Pellerin, Kelly ; Pongsaksawad, Wanida ; Sorescu, Monica ; Majetich, Sara A.
Author_Institution :
Dept. of Phys., Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
9/1/2000 12:00:00 AM
Abstract :
We report variations in the coercivity of CoFe2O4 nanoparticles as a function of particle size, temperature and light intensity. For 30 nm particles, this change in was 2300 Oe at 10 K, 120 Oe at 170 K, for a light intensity of under 2 milliwatts. The remanent magnetization was nearly unchanged by illumination. A simple model of optical absorption followed by electron transfer between Co2+ and Fe3+ ions is proposed
Keywords :
cobalt alloys; coercive force; ferrites; light absorption; magnetic particles; nanostructured materials; photomagnetic effect; remanence; 10 K; 170 K; 2 mW; 30 nm; CoFe2O4; coercivity variations; electron transfer; ferrite nanoparticles; light effect; magnetic properties; optical absorption; photomagnetic effect; remanent magnetization; Cobalt; Coercive force; Electron optics; Ferrites; Lighting; Magnetic properties; Magnetization; Nanoparticles; Particle beam optics; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
