Magnetoresistive transducer for absolute positon detection

J.P.J. Groenland

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    In this paper a new method is presented for the measurement of absolute linear or angular position. The digital position information is recorded serially into one track of a suitable hard-magnetic medium. The stray field of this information layer determines the angular magnetisation distribution in a ferromagnetic (permalloy) detection strip which is positioned parallel to the track but with its plane perpendicular to the hard-magnetic layer. The bit pattern representing the position co-ordinate is regained by detection of the planar magnetoresistance effect in the sensor strip. Experiments have been performed using sensors with a resolution of 250 ¿m and 1 mm respectively and longitudinally recorded audio tape. Suitable sensor output signals could be measured without hysteresis.
    Original languageUndefined
    Pages (from-to)969-971
    Number of pages3
    JournalIEEE transactions on magnetics
    Issue number5
    Publication statusPublished - 1984


    • SMI-TST: From 2006 in EWI-TST
    • IR-55582
    • EWI-5434

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