Permalloy multilayers to reduce the effects of uniaxial anisotropy

Author

Wieberdink, Johan W. ; Eijkel, Kees J M

Author_Institution

Twente Univ., Enschede, Netherlands

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

4278

Lastpage

4282

Abstract

The anisotropic magnetoresistance effect of Permalloy (Ni_0.82Fe_0.18) is used in a contactless angle detector. The uniaxial magnetic anisotropy in a Permalloy thin film causes a difference between the direction of magnetization and the magnetic field direction. This leads to a systematic error in the angle detector output. The effects of uniaxial magnetic anisotropy can be reduced by using Permalloy multilayers with different orientations of their anisotropy axes. A double layer with mutually perpendicular anisotropy axes is found to be sufficient for application in an angle detector. The Stoner-Wohlfarth single-domain model is used to describe the systematic error of an angle detector using multilayers

Keywords

Permalloy; angular measurement; electric sensing devices; magnetic anisotropy; magnetic thin film devices; magnetisation; magnetoresistance; Ni_0.82Fe_0.18; Permalloy; Stoner-Wohlfarth single-domain model; anisotropic magnetoresistance effect; anisotropy axes; contactless angle detector; magnetic field direction; magnetization; systematic error; uniaxial anisotropy; Anisotropic magnetoresistance; Detectors; Magnetic anisotropy; Magnetic field measurement; Magnetic fields; Magnetic films; Magnetic multilayers; Magnetization; Nonhomogeneous media; Permanent magnets;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42592

Filename

42592