Contactless angle detection using permalloy

K.J. Eijkel, R. Rijk
1988 IEEE transactions on magnetics  
An overview will be given of measurements on angle detectors. The detectors consist of a pair of planar-Hall elements opposite to a rotatable magnet. The measurements are performed on a number of planar-Hall elements of different shape and size, and show very good agreement with a previously described theoretical model. To increase the accuracy of the angle detector, three modifications of the original concept of the planar-Hall elements are treated: a: A ring-shaped element having increased
more » ... having increased output b: An optimized configuration of a pair of planar-Hall voltage. elements and a permanent magnet, to cancel out the effects of magnetic anisotropy in the permalloy on the accuracy of the angle detector. to create a magnetically isotropic film. c: An annealing step at 5OOOC applied to the permalloy The results of measurements on planar-Hall elements as suggested in a, b and c are presented and show good agreement with theory. Magnetization behavior in a ring structure, combining magnetic anisotropy and magnetic form effects, is not yet properly understood.
doi:10.1109/20.11594 fatcat:nlxspkqvajdqvlwloki64bpaoq