Sputtered sandwich heads for high-density digital video recording

Author

Dirne, F.W.A. ; Ruigrok, J.J.M.

Author_Institution

Philips Res. Lab., Eindhoven, Netherlands

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

1683

Lastpage

1685

Abstract

A sandwich type of head for application in high-frequency and high-density digital video systems is described. Amorphous CoNbZr films laminated with an Al₂O₃ insulator layer are used as core material. The influence of rotating and static field annealing on the domain structure and on the permeability is discussed. In order to achieve a sufficiently high efficiency, a polycrystalline ferrite back yoke is applied. Sandwich heads with several ceramic materials in the contact plane are evaluated. The performance of the heads is investigated on the basis of a signal-to-noise criterion, defined specially for the digital video application. A sandwich head made with 2 μm×5 μm amorphous CoNbZr, laminated with 0.1 μm Al₂O₃, between glass-ceramic substrates fulfils the requirement on MP tape

Keywords

alumina; cobalt alloys; laminates; magnetic cores; magnetic domains; magnetic heads; magnetic permeability; magnetic recording; magnetic thin film devices; niobium alloys; sputtered coatings; video recording; video tape recorders; zirconium alloys; 0.1 micron; 2 micron; 5 micron; CoNbZr-Al₂O₃; amorphous films; ceramic materials; contact plane; core material; domain structure; glass-ceramic substrates; high-density digital video recording; insulator layer; performance; permeability; polycrystalline ferrite back yoke; signal-to-noise criterion; sputtered sandwich heads; static field annealing; Amorphous materials; Annealing; Ferrite films; Frequency; Magnetic heads; Magnetic materials; Magnetostriction; Permeability; Substrates; Video recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104491

Filename

104491