Reliability of obliquely deposited Co-O thin film with carbon protective layer

Author

Yoshida, Hideki ; Nishizawa, Yasuhiro ; Ouhata, Hisayo

Author_Institution

ME Tape Group, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

2940

Lastpage

2942

Abstract

Advanced ME tape with +5 dB higher output than conventional Hi-8 ME tape at a recording density of 100 kBPI has been developed. It combines an obliquely deposited Co-O magnetic layer and a diamond like carbon (DLC) protective layer. DLC shows higher durability and higher corrosion resistance than other types of protective layer. The main corrosion product found on ME tapes after an accelerated corrosion test was chlorination of Co. DLC is continuous and non-porous even at a thickness of 10 nm, and probably is the reason for drastic improvement of corrosion resistance. Corrosion resistance of the small cassette tape for Consumer-Use Digital VCR including advanced ME tape was evaluated by the Battelle test. Its storage life was evaluated as more than 28 years even in the cassette lid portion

Keywords

carbon; cobalt compounds; corrosion; corrosion protective coatings; magnetic recording; magnetic tapes; magnetic thin films; Battelle test; C; Co-O; Consumer-Use Digital VCR; ME tape; cassette tape; chlorination; corrosion resistance; diamond like carbon protective layer; durability; obliquely deposited Co-O magnetic thin film; recording density; reliability; storage life; Corrosion; High definition video; Magnetic recording; Protection; Rough surfaces; Sputtering; Surface resistance; Surface roughness; Testing; Video recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.490197

Filename

490197