Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 36, Issue 5, Pages 3029-3031Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/20.908666
Keywords
cobalt ferrite; coercivity; photomagnetic effect; remanent magnetization
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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 10K, 120 Oe at 170K, 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.
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