Synthesis of nano-sized spherical barium-strontium ferrite particles

Author

Gee, S.H. ; Hong, Y.K. ; Jeffers, F.J. ; Park, M.H. ; Sur, J.C. ; Weatherspoon, C. ; Nam, I.T.

Author_Institution

Dept. of Mater. Sci. & Eng., Idaho Univ., Moscow, ID, USA

Volume

41

Issue

11

fYear

2005

Firstpage

4353

Lastpage

4355

Abstract

Magnetic recording media requires good particle dispersion, a smooth surface, and small interparticle interaction to make an adequate signal-to-noise ratio (SNR). Well dispersed 50-60 nm sized spherical barium-strontium ferrite (S-Ba/Sr-Fe) nanoparticles were successfully prepared with 40 nm sized hematite precursor particles and BaCO₃/SrCO₃ colloid. The coercivity and saturation magnetizations of S-Ba/Sr-Fe nano-particles were 1568 Oe and 48.6 emu/g, respectively. In order to evaluate magnetic interaction, magnetic tape was prepared using an Eiger mill with binder and organic solvent. ΔM measurement showed the S-Ba/Sr-Fe nanoparticles in the tape had negative magnetic particle-to-particle interaction.

Keywords

barium compounds; coercive force; ferrite devices; magnetic recording; magnetic tape storage; nanoparticles; strontium compounds; 50 to 60 nm; BaCO₃-SrCO₃; Eiger mill; S-Ba-Sr-Fe; coercivity; magnetic interaction; magnetic recording media; magnetic tape; nanosized spherical particles synthesis; particle dispersion; saturation magnetizations; Coercive force; Ferrites; Magnetic recording; Milling machines; Nanoparticles; Particle measurements; Saturation magnetization; Signal synthesis; Signal to noise ratio; Solvents; Barium ferrite; magnetic interaction; nanoparticles; particulate recording media;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2005.855248

Filename

1532351