Effect of light on the magnetic properties of cobalt ferrite nanoparticles

We report variations in the coercivity of CoFe/sub 2/O/sub 4/ 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 un...

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Veröffentlicht in:	IEEE transactions on magnetics 2000-09, Vol.36 (5), p.3029-3031
Hauptverfasser:	Giri, A.K., Pellerin, K., Pongsaksawad, W., Sorescu, M., Majetich, S.A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Cobalt Cobalt ferrites Coercive force Condensed matter: electronic structure, electrical, magnetic, and optical properties Electron optics Exact sciences and technology Ferrites Fine-particle systems Illumination Lighting Magnetic properties Magnetic properties and materials Magnetism Magnetization Mathematical models Nanoparticles Particle beam optics Particle size Physics Small particles and nanoscale materials Studies of specific magnetic materials Temperature
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Beschreibung
Zusammenfassung:	We report variations in the coercivity of CoFe/sub 2/O/sub 4/ 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 Co/sup 2+/ and Fe/sup 3+/ ions is proposed.
ISSN:	0018-9464 1941-0069
DOI:	10.1109/20.908666