Domain observations of write poles which comprise NiFe double layers by type II contrast electron microscopy

Author

Kobayashi, Kazuo ; Donnet, David M. ; Takahashi, Yoshio

Author_Institution

Fujitsu Labs. Ltd., Atsugi, Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2517

Lastpage

2519

Abstract

Using the lock-in technique in a scanning electron microscope, we observed the magnetic domain structure of Ni₅₀Fe₅₀/Ni₈₁Fe₁₉ double layer upper write poles of merged type MR heads by changing the electron acceleration voltage. Heads with highest dibit resolution exhibit flux closure domain structure both in Ni₅₀Fe₅₀ and Ni ₈₁Fe₁₉ layers. The Ni₈₁Fe₁₉ layer has the effect of forcing the domain structure in the Ni₅₀Fe₅₀ layer towards a flux closure structure through exchange coupling

Keywords

Permalloy; iron alloys; magnetic domains; magnetic flux; magnetic heads; magnetic multilayers; magnetoresistive devices; nickel alloys; scanning electron microscopy; Ni₅₀Fe₅₀-Ni₈₁Fe₁₉; dibit resolution; electron acceleration voltage; exchange coupling; flux closure domain structure; lock-in technique; magnetic domain structure; merged type MR heads; scanning electron microscope; type II contrast electron microscopy; write poles; Acceleration; Magnetic domains; Magnetic force microscopy; Magnetic heads; Magnetic materials; Magnetostriction; Microwave integrated circuits; Scanning electron microscopy; Transmission electron microscopy; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800877

Filename

800877