Patent ID: 7312959

Claim:
A magnetic sensor comprising: a lower shield layer having a protruding portion; a multilayer film having a free magnetic layer, a first non-magnetic material layer, and a first fixed magnetic layer disposed above the protruding portion of the lower shield layer; bias layers provided at two sides of the multilayer film in a track width direction with a predetermined space therebetween, the predetermined space determining a track width; second fixed magnetic layers extending from the first fixed magnetic layer to the two sides of the multilayer film in the track width direction; a pair of first antiferromagnetic layers which are provided with the multilayer film therebetween in the track width direction and which are formed under the second fixed magnetic layers and in direct contact with the second fixed layers; and a pair of second antiferromagnetic layers which are provided with a predetermined space therebetween in the track width direction and which are formed on the second fixed magnetic layers and in direct contact with the second fixed layers.