Permalloy multilayers to reduce the effects of uniaxial anisotropy

The anisotropic magnetoresistance effect of Permalloy (Ni/sub 0.82/Fe/sub 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...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1989-09, Vol.25 (5), p.4278-4282
Main Authors: Wieberdink, J.W., Eijkel, K.J.M.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Detectors
Exact sciences and technology
Magnetic anisotropy
Magnetic field measurement
Magnetic fields
Magnetic films
Magnetic multilayers
Magnetic properties and materials
Magnetic properties of surface, thin films and multilayers
Magnetization
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Nonhomogeneous media
Other topics in magnetic properties and materials
Permanent magnets
Physics
Specific materials
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Summary:The anisotropic magnetoresistance effect of Permalloy (Ni/sub 0.82/Fe/sub 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.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.42592