Title :
Magnetic properties of a series of ferrite nanoparticles synthesized in reverse micelles
Author :
Seip, Candace T. ; Carpenter, Everett E. ; Connor, Charles J O ; John, Vijay T. ; Li, Sichu
Author_Institution :
Adv. Mater. Res. Inst., New Orleans Univ., LA, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
Nanoscale particles of the general formula MFe2O4 (M=Co, Mn, Fe) were synthesized in reverse micelles of twin-tailed anionic bis(2-ethylhexyl) sodium sulfosuccinate (AOT) in isooctane. The size of the particles was controlled by adjusting the AOT/water molar ratio. Particle sizes were confirmed using XRD and uniformity was determined by SEM. Magnetic measurements, carried out using a SQUID Susceptometer, indicated superparamagnetic behavior. FC and ZFC demagnetization experiments indicate blocking temperatures of 46 K, 30 K, and 7 K for for MFe2O4 M=Co, Mn, Fe respectively. Below blocking temperatures, the nanoparticles demonstrate hysteresis with coercivities of Hc=6000G, 3800G, and 500G for the Co, Mn, and Fe ferrites
Keywords :
cobalt compounds; demagnetisation; ferrites; magnetic particles; manganese compounds; nanostructured materials; particle size; scanning electron microscopy; superparamagnetism; CoFe2O4; Fe3O4; MnFe2O4; SEM; XRD; blocking temperatures; coercivities; ferrite nanoparticles; hysteresis; magnetic properties; particle sizes; reverse micelles; superparamagnetic behavior; twin-tailed anionic bis(2-ethylhexyl) sodium sulfosuccinate in isooctane; Ferrites; Iron; Magnetic properties; Magnetic susceptibility; Magnetic variables measurement; Nanoparticles; SQUIDs; Size control; Temperature; X-ray scattering;
Journal_Title :
Magnetics, IEEE Transactions on
