Thin-film head domain structures versus Permalloy composition: strain determination and frequency response

Author

Koeppe, Peter V. ; Re, Mark E. ; Kryder, Mark H.

Author_Institution

Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

28

Issue

1

fYear

1992

fDate

1/1/1992 12:00:00 AM

Firstpage

71

Lastpage

75

Abstract

The influence of the composition of plated Permalloy on the resulting magnetic domain structure in the upper yoke of inductive thin-film magnetic recording heads has been investigated. The response of the magnetization from four otherwise similar thin-film heads, ranging in iron content from 18 to 21% by weight, has been imaged by means of a scanning magnetooptic photometer. Radially compressive (and/or circumferentially tensile) strain is shown to exist in each of these heads about the rear magnetic closure, yielding a transition from radial to circumferential domain structures across the range of compositions. Mechanisms for the conduction of magnetic flux in each of these structures are demonstrated at 1 and 20 MHz

Keywords

Permalloy; frequency response; magnetic domains; magnetic heads; magnetic recording; magnetic thin film devices; magnetisation; 1 MHz; 20 MHz; circumferential domain structures; frequency response; inductive thin-film magnetic recording heads; magnetic domain structure; magnetic flux conduction; magnetisation response; plated Permalloy composition; radial domain structure; radially compressive strain; scanning magnetooptic photometer; Iron; Magnetic domains; Magnetic films; Magnetic flux; Magnetic heads; Magnetic recording; Magnetization; Magnetooptic recording; Photometry; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.119818

Filename

119818