Spin-spray ferrite-plated Co ferrite films with high coercivity for perpendicular magnetic recording media

Author

Zhang, Fuchun ; Kantake, Shusuke ; Kitamoto, Yoshitaka ; Abe, Masanori

Author_Institution

Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2751

Lastpage

2753

Abstract

Effects of plating conditions on Co ferrite-plated films for perpendicular magnetic recording media were investigated to increase coercivity H_c⊥ and remanence ratio (M_r/M_s)_⊥ in the plane perpendicular to the film. By optimizing a concentration of NaNO₂ in an oxidizing solution and the deposition rate, Co-Ni ferrite films with H_c⊥ of 3200 Oe and (M_r/M_s)_⊥ of 0.6 were obtained without any heat-treatment. Disk media with higher H_c⊥ and (M_r/M_s)_⊥, exhibited reproduced waveforms of di-pluses shape and better frequency responses than that with lower _c⊥ and (M_r/M_s)_⊥. Media noise did not increase with increasing frequency, suggesting that the transition noise was low

Keywords

coercive force; ferrites; hard discs; magnetic recording noise; magnetic thin film devices; magnetic thin films; perpendicular magnetic recording; remanence; spin coating; spray coating techniques; CoFe₂O₄; coercivity; deposition rate; disk media; ferrite thin film recording media; frequency responses; media noise; oxidizing solution; perpendicular magnetic recording media; plating conditions; remanence ratio; spin-spray ferrite plating; transition noise; Coercive force; Crystallization; Ferrite films; Magnetic films; Magnetic noise; Noise shaping; Perpendicular magnetic recording; Remanence; Spinning; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800974

Filename

800974