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Eddy Current-Induced Stray Magnetic Field Cancellation Technique for B-H Loop Applications Disclosure Number: IPCOM000046728D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07

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Hamaker, RW Kobiela, PJ Laming, FP [+details]


The use of hysteresigraphic techniques to characterize the magnetic properties of both thick and thin film samples is well known in the literature [1-4]. Such techniques provide both a rapid and a reasonably accurate method for determining the B-H loop characteristics of a film sample. One common B-H loop measurement procedure is to introduce a magnetic film sample into a sense coil, whose output had previously been nulled by a similar coil (bucking coil) in series with the sense coil prior to sample introduction. The resultant output signal is differentially amplified and integrated, then displayed on a CRT screen, as shown schematically in Fig. 1. The differential mode of sample detection has an inherent advantage over the single-ended sense coil mode of operation.