Write heads with pole tip consisting of high-Bs FeCoAlO films

Author

Ikeda, S. ; Tagawa, I. ; Uehara, Y. ; Kubomiya, T. ; Kane, J. ; Kakehi, M. ; Chikazawa, A.

Author_Institution

Magnetic Component Div., Fujitsu Ltd, Nagano, Japan

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2219

Lastpage

2221

Abstract

We investigated the magnetic properties, corrosion resistance, and microstructure for the sputtered FeCoAlO films, and the properties of write heads that use them for pole tips. The FeCoAlO films have soft magnetic properties as well as magnetic induction Bs ∼ 2.2 T, which is equal to the Bs of pure-Fe. In-plane uniaxial anisotropy for the as-made films is almost unchanged though a magnetic field is applied during annealing, i.e., the magnetic annealing effect is negligible. The films have sufficient magnetic thermal stability and corrosion resistance to withstand magnetic head fabrication processes. For write heads with pole tips which consist of FeCoAlO films, the overwrite (O/W) and the nonlinear transition shift (NLTS) show about -35 dB and 13%, respectively. Therefore, these FeCoAlO films can be advantageously applied to writing heads.

Keywords

aluminium compounds; annealing; cobalt compounds; corrosion resistance; electromagnetic induction; ferromagnetic materials; iron compounds; magnetic anisotropy; magnetic heads; magnetic thin films; soft magnetic materials; sputtered coatings; thermal stability; 2.2 T; Al₂O₃; Al₂O₃ powders; Fe_73.2Co_18.3Al_1.9O_6.6; Fe₈₀Co₂₀; Fe₈₀Co₂₀ alloy; FeCoAlO; annealing; as-made films; corrosion resistance; high-Bs FeCoAlO films; in-plane uniaxial anisotropy; magnetic annealing effect; magnetic field; magnetic head fabrication processes; magnetic induction; magnetic properties; magnetic thermal stability; microstructure; nonlinear transition shift; overwrite; pole tip; soft magnetic properties; sputtered FeCoAlO films; write heads; Annealing; Corrosion; Magnetic anisotropy; Magnetic films; Magnetic heads; Magnetic properties; Microstructure; Perpendicular magnetic anisotropy; Soft magnetic materials; Thermal resistance;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.802664

Filename

1042143