Title :
Permalloy multilayers to reduce the effects of uniaxial anisotropy
Author :
Wieberdink, Johan W. ; Eijkel, Kees J M
Author_Institution :
Twente Univ., Enschede, Netherlands
fDate :
9/1/1989 12:00:00 AM
Abstract :
The anisotropic magnetoresistance effect of Permalloy (Ni0.82 Fe0.18) 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; Ni0.82Fe0.18; 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;
Journal_Title :
Magnetics, IEEE Transactions on
