Title :
Conversion of Nano-Sized Spherical Magnetite to Spherical Barium Ferrite Nanoparticles for High Density Particulate Recording Media
Author :
Jalli, Jeevan ; Hong, Yang-Ki ; Bae, Seok ; Abo, Gavin S. ; Lee, Jae-Jin ; Sur, Jung-Chul ; Gee, Sung-Hoon ; Kim, Seong-Gon ; Erwin, Steven C. ; Moitra, Amitava
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Alabama, Tuscaloosa, AL, USA
Abstract :
We report 24-30 nm spherical barium ferrite (S-BaFe) particles having extremely narrow size distribution without any superparamagnetic phase. We have converted spherical magnetite (S-Mag) nanoparticles to S-BaFe nanoparticles using a unique adsorption-diffusion process. The synthesized S-BaFe nanoparticles were characterized by X-ray diffractometer, Mossbauer spectrometer, transmission electron microscope (TEM), and vibrating magnetometer (VSM) for magnetic and physical properties. Saturation magnetization and coercivity of the S-BaFe nanoparticles were found to be 41.4 emu/g and 4075 Oe, respectively. The thermal stability of Ku V/kB T ap 107 was estimated for the S-BaFe nanoparticles from time-dependent remanent coercivity measurement.
Keywords :
Mossbauer effect; X-ray diffraction; adsorption; barium compounds; coercive force; diffusion; ferrites; magnetic particles; magnetisation; nanofabrication; nanoparticles; remanence; storage media; thermal stability; transmission electron microscopy; BaFe2O4; Mossbauer spectrometer; TEM; X-ray diffractometer; adsorption-diffusion process; high density particulate recording media; nanosized spherical magnetite; remanent coercivity; saturation magnetization; size 24 nm to 30 nm; spherical barium ferrite nanoparticles; thermal stability; transmission electron microscope; vibrating magnetometer; Barium ferrite; dynamic remanent coercivity; inter-particle interaction; particulate recording media; thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2009.2022496
