Effective permeability of soft magnetic layers adjacent to recorded media

Author

Monson, J.E. ; Coughlin, T.M.

Author_Institution

Harvey Mudd Coll., Claremont, CA, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2700

Lastpage

2702

Abstract

The finite thickness of soft magnetic layers used to “keeper” magnetic recording media results in an effective permeability of the soft magnetic layer which is lower than the bulk material permeability. Multiple imaging techniques are used to create expressions for the effective permeability as a function of soft magnetic film thickness and the magnetic recording frequency. Using measurements of leakage fields through the keeper layer from a magnetized recording media at various recording frequencies and with various keeper thicknesses we can determine the permeability of the soft magnetic layers vs keeper thickness and recording frequency

Keywords

magnetic leakage; magnetic permeability; magnetic recording; magnetic shielding; magnetic thin films; soft magnetic materials; effective permeability; keeper layer; leakage fields; magnetic film thickness; magnetic recording frequency; magnetic recording media; multiple imaging techniques; soft magnetic layers; Demagnetization; Magnetic films; Magnetic materials; Magnetic recording; Magnetic shielding; Permeability measurement; Perpendicular magnetic recording; Soft magnetic materials; Space charge; Thickness measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800957

Filename

800957