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

Volume

45

Issue

10

fYear

2009

Firstpage

3590

Lastpage

3593

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 K_u V/k_B 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2022496

Filename

5257251