Preparation of Co-Cr alloy/Ni-Zn ferrite double-layered films for perpendicular magnetic tape

Author

Kitamoto, Yoshitaka ; Abe, Masanori ; Naoe, Masahiko

Author_Institution

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

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

3834

Lastpage

3836

Abstract

Co-Cr alloy/Ni-Zn ferrite double-layered films for perpendicular magnetic recording tape are proposed to improve high frequency characteristics, and their preparation is described. The films were deposited by the “Ferrite Plating” method which enables to synthesize the soft magnetic spinel ferrite layers at low temperatures below 100°C and by the facing targets sputtering (FTS) for the Co-Cr layers. It was found that the Co-Cr layers need to compensate the tensile internal stress of 1.0-1.5×10⁹ dyn/cm² in the ferrite plated backlayers to avoid curling of the tape and to improve adhesion of the backlayers to substrates, and Ar pressure of 0.2-0.3 mTorr in the FTS was proper for depositing the Co-Cr layers with the optimum compressive stress and the excellent crystallinity

Keywords

chromium alloys; cobalt alloys; ferrites; internal stresses; magnetic multilayers; magnetic tapes; magnetic thin films; nickel compounds; perpendicular magnetic recording; soft magnetic materials; sputtered coatings; zinc compounds; 0.2 to 0.3 mtorr; 100 C; Co-Cr alloy/Ni-Zn ferrite double-layered film; CoZr-NiZnFe₂O₄; adhesion; crystallinity; curling; facing targets sputtering; ferrite plating; high frequency characteristics; internal stress; perpendicular magnetic tape; preparation; soft magnetic spinel ferrite; Adhesives; Argon; Ferrite films; Frequency; Internal stresses; Magnetic films; Perpendicular magnetic recording; Soft magnetic materials; Sputtering; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.539188

Filename

539188