Conversion of Worm-Shaped Antiferromagnetic Hematite to Ferrimagnetic Spherical Barium-Ferrite Nanoparticles for Particulate Recording Media

Author

Jalli, J. ; Yang-Ki Hong ; Jae-Jin Lee ; Abo, G.S. ; Ji-Hoon Park ; Lane, A.M. ; Seong-Gon Kim ; Erwin, S.C.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Alabama, Tuscaloosa, AL, USA

Volume

1

fYear

2010

fDate

7/2/1905 12:00:00 AM

Firstpage

4500204

Lastpage

4500204

Abstract

We used a modified, two-step hydrothermal process to produce worm-shaped antiferromagnetic hematite-barium iron oxide particles and converted them to 25-45 nm spherical ferrimagnetic barium-ferrite (S-BaFe) nanoparticles for high-density magnetic recording media application. Saturation magnetization and coercivity of the S-BaFe nanoparticles were 50.7 emu/g and 4311 Oe, respectively. The thermal stability of KuV/k B T ≈ 81 was estimated for the S-BaFe nanoparticles from time-dependent remanent coercivity measurements.

Keywords

antiferromagnetic materials; barium compounds; coercive force; ferrimagnetic materials; magnetic recording; magnetic transitions; nanofabrication; nanoparticles; remanence; thermal stability; BaFe; ferrimagnetic spherical barium-ferrite nanoparticles; high-density magnetic recording media; hydrothermal process; particulate recording media; saturation magnetization; size 25 nm to 45 nm; thermal stability; time-dependent remanent coercivity measurement; worm-shaped antiferromagnetic hematite; Barium; Ferrites; Magnetic recording; Media; Nanoparticles; Saturation magnetization; Thermal stability; Information storage; barium ferrite; dynamic remanent coercivity; particulate recording media; thermal stability;

fLanguage

English

Journal_Title

Magnetics Letters, IEEE

Publisher

ieee

ISSN

1949-307X

Type

jour

DOI

10.1109/LMAG.2010.2087315

Filename

5638315