Browse Prior Art Database

Silicon Nitride Coating on Ferrite Read/Write Heads

IP.com Disclosure Number: IPCOM000043174D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Cox, AR: AUTHOR [+3]

Abstract

Laminar ferrite cores for read/write magnetic heads are protected against wear by plasma deposition of silicon nitride on the outer faces of the core. This deposition also rounds off sharp corners. An earlier article [*] describes the sputter deposition of alumina which may be used in the manufacture of magnetic heads to provide a wear-resistant coating. This deposition process has the disadvantage that the time taken to deposit a thin film may typically be 30 hours and the resultant coating may be highly stressed. Here, the use of silicon nitride as an alternative to alumina is disclosed. Silicon nitride is formed by plasma-induced reaction at typically 300ŒC.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Silicon Nitride Coating on Ferrite Read/Write Heads

Laminar ferrite cores for read/write magnetic heads are protected against wear by plasma deposition of silicon nitride on the outer faces of the core. This deposition also rounds off sharp corners. An earlier article [*] describes the sputter deposition of alumina which may be used in the manufacture of magnetic heads to provide a wear-resistant coating. This deposition process has the disadvantage that the time taken to deposit a thin film may typically be 30 hours and the resultant coating may be highly stressed. Here, the use of silicon nitride as an alternative to alumina is disclosed. Silicon nitride is formed by plasma- induced reaction at typically 300OEC. This provides a relatively unstressed wear coating of greater hardness than alumina, typically requires less than 1 hour for deposition and shows good adhesion to a ferrite substrate. A further advantage of this deposition is its ability to round off sharp corners, thus preventing the shorting of the windings to the ferrite core. Reference [*] R. W. Burkhart, A. R. Cox and J. D. Hartley, "Uniform Deposition of Alumina on Thin Ferrite Substrates," IBM Technical Disclosure Bulletin 23, 5149 (April 1981).

1