期刊
JOURNAL OF APPLIED PHYSICS
卷 105, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3072019
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资金
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0852862] Funding Source: National Science Foundation
CoFe2O4 nanoparticles prepared by chemical coprecipitation method in a magnetic field exhibit novel magnetic properties. The average particle diameter was about 2 nm and larger depending on the post annealing temperature. Magnetization measurements indicate that smaller nanoparticles are superparamagnetic above their respective blocking temperatures. In the blocked state, these nanoparticles exhibit interesting behaviors in the magnetic hysteresis measurements. Constricted, or wasp waisted with extremely narrow waist, hysteresis curves have been observed in the magnetization versus field sweeps. For larger nanoparticles, the room temperature hysteresis is typical of a ferromagnet with an open loop, but the loop closes at lower temperature. The novel magnetic behavior is attributed to the directional order of Co ions and vacancies in CoFe2O4 established during the coprecipitation of the nanoparticles under an applied field. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3072019]
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