Effects of CoTi-doping on longitudinal barium ferrite thin film media

Author

Sui, Xiaoyu ; Kryder, Mark H.

Author_Institution

Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4044

Lastpage

4046

Abstract

It is shown that the coercivity of barium ferrite thin film media can be adjusted over a very wide range from 1000 Oe to 4000 Oe by the proper amount of CoTi-doping. The coercivity decreases dramatically with increasing CoTi concentrations in the film, while the saturation magnetization decreases only slightly. The optimized S_q, S* and SFD values are relatively unaffected by CoTi-doping. The grain size decreases as the amount of CoTi-doping increases. A multilayer structure consisting of alternating pure barium ferrite and CoTi-doped barium ferrite layers has been demonstrated to be useful for controlling the overall film composition through a diffusion process. The direct correspondence between the coercivity and the composition provides a guideline for the practical use of this material

Keywords

barium compounds; coercive force; ferrites; grain size; magnetic multilayers; magnetic recording; magnetic thin films; magnetisation; BaFe₁₂O₁₉-BaFe₁₂O₁₉:Co,Ti; CoTi-doping; coercivity; diffusion; film composition; grain size; longitudinal barium ferrite thin film media; multilayer structure; saturation magnetization; Barium; Coercive force; Crystallization; Diffusion processes; Ferrite films; Grain size; Magnetic films; Saturation magnetization; Sputtering; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.333984

Filename

333984