MAGNETORESISTANCE EFFECT HEAD, METHOD FOR PRODUCING MAGNETORESISTANCE EFFECT HEAD, AND INFORMATION REPRODUCING DEVICE

摘要

A magnetoresistance effect head for well reproducing information recorded on a recorded medium at high recording density while suppressing Barkhausen noise, comprising a magnetoresistance effect device which is made up of a flat multilayer film including a lowermost free magnetic layer in which the direction of magnetization changes depending on the external magnetic field and exhibits a resistance change depending on the strength of the external magnetic field, a nonmagnetic substrate, an insulating layer in contact with the central portion of the lower surface of the free magnetic layer on the substrate side, a couple of electrode layers in contact with both respective ends of the lower surface of the free magnetic layer on the substrate side, formed with the insulating layer therebetween, flush with the surface of the insulating layer, and adapted for allowing a current to flow through the magnetoresistance effect device, and a couple of magnetic domain wall control layer so formed as to extend with the magnetic resistance effect device therebetween and adapted for suppressing the domain wall displacement in the free magnetic layer.