Measurements of the anisotropy in permalloy

C.J.M. Eijkel

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A measurement system is described, which accurately determines the anisotropy field H/sub k/ and the orientation of the easy-axis in a permalloy film or in any material showing magnetization induced resistance anisotropy. An accuracy of 0.1% in H/sub k/ and 0.1 degrees in easy-axis orientation is reached in permalloy when the applied field strength is 2.5 H/sub k/. Deviations from the Stoner-Wohlfarth single domain model can be recognized after the analysis of the measurement. Four electrical contacts have to be positioned on the permalloy in a planar-Hall configuration. Aluminum contacts realized by a standard lithographic process are used, providing a reference for the easy-axis orientation and an accurate relative orientation of the different planar-Hall elements that can be made out of a single film.
Original languageUndefined
Pages (from-to)1957-1959
JournalIEEE transactions on magnetics
Issue number2, par
Publication statusPublished - 1988


  • IR-55643

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