Patent ID: 6977799

Claim:
A magnetic head comprising: a magnetoresistive device including a laminate structure in which a non-magnetic layer is interposed between a first magnetic layer and a second magnetic layer, a yoke for introducing an external magnetic field from a magnetic gap to the magnetoresistive device; a current introducing part for allowing current to flow between the first magnetic layer and the second magnetic layer via the non-magnetic layer; a measuring part for detecting a change in resistance occurring between the first magnetic layer and the second magnetic layer in accordance with a relative magnetization angle between the first magnetic layer and the second magnetic layer that is changed by the external magnetic field induced via the yoke; and a substrate over which the magnetoresistive device and the yoke are formed, wherein at least one magnetic gap is formed between a part of the yoke provided so as to constitute at least a part of one magnetic layer selected from the first magnetic layer and the second magnetic layer and a remaining part of the yoke, and the one magnetic layer is a layer in which magnetization rotation is caused more easily by external magnetization than in the other magnetic layer, and the one magnetic layer comprises at least two magnetic films and at least one non-magnetic film that are laminated alternately, the pair of adjacent magnetic films are coupled antiferromagnetically via the non-magnetic film, and a magnetic moment is not closed in the at least two magnetic films.