A shield type magnetoresistive head has a GMR element exhibiting a giant magentoresistance effect phenomenon due to a spin dependent scattering, and an electrode, the GMR element comprising upper and lower shield films, upper and lower gap insulation films, a magnetic field detecting layer in which...http://www.google.com.au/patents/US5818684?utm_source=gb-gplus-sharePatent US5818684 - Shield type magnetoresistive head arranged for weakening of a galvano-current magnetic field 
