Magnetoresistive sensor having at least a layer system and a plurality of measuring contacts disposed thereon, and a method of producing the sensor

  • US 5,686,838 A
  • Filed: 06/19/1995
  • Issued: 11/11/1997
  • Est. Priority Date: 12/21/1992
  • Status: Expired due to Term
First Claim
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1. A magnetoresistive sensor comprising:

  • a) a layer system, wherein said layer system includes;

    a1) at least one measuring layer which, in the plane of said measuring layer, has a magnetization which at least in one direction depends reversibly on an applied magnetic field, and in the absence of said magnetic field, said magnetization corresponds to a predefined ground state magnetization;

    a2) at least on one side of the measuring layer a bias layer having a magnetization in the plane of said bias layer, said magnetization being at least approximately constant in the measuring range of the magnetic field;

    a3) an interlayer, disposed between the bias layer and the measuring layer, by which interlayer the bias layer is at least approximately magnetically exchange-decoupled from the measuring layer; and

    a4) a magnetic layer which is coupled anti-ferromagnetically to the bias layer through a coupling layer, said coupling layer being disposed between the bias layer and the anti-ferromagnetically coupled magnetic layer; and

    b) measuring contacts at the layer system to detect a resistance signal which is a measure for the applied magnetic field.

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