Tuning of magnetic properties in cobalt ferrite nanocrystals
- Department of Chemistry, University of Puerto Rico, Mayagueez, 00681-9019 (Puerto Rico)
- Department of Engineering Science and Materials, University of Puerto Rico, Mayagueez, 00681-9044 (Puerto Rico)
- Department of Physics, University of Puerto Rico, Mayagueez, 00681-9016 (Puerto Rico)
- Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706-1595 (United States)
Cobalt ferrite (CoFe{sub 2}O{sub 4}) possesses excellent chemical stability, good mechanical hardness, and a large positive first order crystalline anisotropy constant, making it a promising candidate for magneto-optical recording media. In addition to precise control of the composition and structure of CoFe{sub 2}O{sub 4}, its practical application will require the capability to control particle size at the nanoscale. The results of a synthesis approach in which size control is achieved by modifying the oversaturation conditions during ferrite formation in water through a modified coprecipitation approach are reported. X-ray diffraction, transmission electron microscopy (TEM) diffraction, and TEM energy-dispersive x-ray spectroscopy analyses confirmed the formation of the nanoscale cobalt ferrite. M-H measurements verified the strong influence of synthesis conditions on crystal size and hence, on the magnetic properties of ferrite nanocrystals. The room-temperature coercivity values increased from 460 up to 4626 Oe under optimum synthesis conditions determined from a 2{sup 3} factorial design.
- OSTI ID:
- 21137325
- Journal Information:
- Journal of Applied Physics, Vol. 103, Issue 7; Conference: 52. annual conference on magnetism and magnetic materials, Tampa, FL (United States), 5-9 Nov 2007; Other Information: DOI: 10.1063/1.2838215; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Harnessing microbial subsurface metal reduction activities to synthesise nanoscale cobalt ferrite with enhanced magnetic properties
Synthesis and Characterization of Zirconium Substituted Cobalt Ferrite Nanopowders