Co-based superstructured nitride alloy films: characteristics and applications for high frequency heads

Author

Kaminaka, N. ; Sakakima, H. ; Takahashi, K. ; Osano, K. ; Hasegawa, H.

Author_Institution

Matsushita Electr. Ind. Co. Ltd., Osaka, Japan

Volume

26

Issue

6

fYear

1990

fDate

11/1/1990 12:00:00 AM

Firstpage

2936

Lastpage

2941

Abstract

Co-based superstructured films composed of 25-nm-thick non-nitride and nitride layers were prepared by N₂ reactive RF sputtering. The films have high 4πM_s=13 kG, a high permeability μ=3000, and a high thermal stability of the magnetic properties. Magnetic heads composed of laminated superstructured films insulated with SiO₂ films were developed for high-frequency operations. The heads show excellent recording capability for narrow gap recording with metal tapes and high reproduction characteristics at frequencies over 10 MHz. They achieve an increase of more than 4 dB in normalized output when compared with conventional laminated-type amorphous film heads. The superstructured nitride film heads are expected to be used in next-generation VCRs, which operate with higher density recording and wider frequency bands

Keywords

cobalt alloys; magnetic heads; magnetic permeability; magnetic recording; magnetic thin film devices; niobium alloys; sputtered coatings; zirconium alloys; 10 MHz; 25 nm; Co-based superstructured nitride alloy films; CoNbZr-CoNbZrN; N₂ reactive RF sputtering; SiO₂; SiO₂ films; VCR; high frequency heads; high permeability; high thermal stability; higher density recording; laminated superstructured films; magnetic properties; metal tapes; narrow gap recording; recording capability; wider frequency bands; Amorphous materials; Insulation; Magnetic films; Magnetic heads; Magnetic properties; Magnetic recording; Permeability; Radio frequency; Sputtering; Thermal stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.102869

Filename

102869