Exchange coupling and edge pinning in vertical head sensors

Author

Pohm, A.V. ; Anderson, J.M. ; Beech, R.S. ; Daughton, J.M.

Author_Institution

NVE Corp., Eden Prarie, MN, USA

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1681

Lastpage

1683

Abstract

Calculations which were done for an idealized geometry, showed that exchange coupling around the edge of a sandwich structure formed by folding the top magnetic layer around the edge and connecting to the bottom magnetic layer, increases the field necessary to nucleate the rotational reversal of the edge magnetization by a factor of more than 9. In a more realistic case, the coupling material is likely to be less uniform and somewhat irregular providing an additional contribution to the edge magnetization coercive force. Edge coupling is a major contributor to the high edge coercive force for “hard edge” sensors

Keywords

coercive force; exchange interactions (electron); giant magnetoresistance; magnetic heads; magnetic sensors; magnetisation reversal; bottom magnetic layer; edge magnetization; edge pinning; exchange coupling; hard edge sensors; high edge coercive force; idealized geometry; rotational reversal; sandwich structure; top magnetic layer; vertical head sensors; Couplings; Equations; Geometry; Magnetic anisotropy; Magnetic heads; Magnetic materials; Magnetic sensors; Magnetization; Micromagnetics; Perpendicular magnetic anisotropy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950936

Filename

950936