Newly developed inductive write head with electroplated CoNiFe film

Author

Ohashi, K. ; Yasue, Y. ; Saito, M. ; Yamada, K. ; Osaka ; Takai, M. ; Hayashi, K.

Author_Institution

NEC Corp., Ibaraki, Japan

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1462

Lastpage

1464

Abstract

A newly developed CoNiFe film is investigated from the viewpoint of its application to MR write heads. Film composition is Co₆₅Ni₁₂Fe₂₃, prepared by electroplating to obtain a b.c.c. plus f.c.c. mixed phase at that composition. Films with mixed phases show improved soft magnetic properties (B_s is 2.0-2.1 T and the magnetostriction coefficient is +1.8×10^-6 to +7.4×10^-6) and also show improved corrosion resistance. Performance of a head with a double layer structure of a 0.3 μm CoNiFe film and a 4.1 μm NiFe film is investigated, and a short throat height is found to give better overwrite performance

Keywords

cobalt alloys; corrosion; electroplated coatings; iron alloys; magnetic heads; magnetic thin film devices; magnetostriction; nickel alloys; BCC-FCC mixed phase; Co₆₅Ni₁₂Fe₂₃; corrosion resistance; double layer structure; electroplated CoNiFe film; inductive write head; magnetostriction coefficient; overwrite performance; soft magnetic properties; throat height; Composite materials; Corrosion; Magnetic films; Magnetic heads; Magnetic materials; Magnetic properties; Magnetostriction; National electric code; Thermal resistance; Thermal stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706583

Filename

706583