Patent ID: 7852603

Claim:
A perpendicular magnetic recording head, comprising: a main magnetic pole layer; a sub-yoke layer formed in contact with the main magnetic pole layer; and a coil layer that applies a magnetic field to the main magnetic pole layer and the sub-yoke layer, wherein the main magnetic pole layer has an elongated front end portion restricting a track width Tw and a large-width portion having a width larger in a track width direction than that of the front end portion, which is provided in the rear of a height side of the front end portion, wherein a front end face of the sub-yoke layer that faces an opposed surface retreats in a height direction from the opposed surface, the large-width portion of the main magnetic pole layer is overlapped with the sub-yoke layer, and the front end portion projects in a front of the front end face so as to be exposed from the opposed surface, wherein the sub-yoke layer has a multi-magnetic domain structure and the magnetic domain having a track-widthwise component larger than a heightwise component is formed in contact with at least a part of the front end face when the heightwise component of a magnetic moment is compared with the track-widthwise component of the magnetic moment, and wherein an area equal to or larger than a half of a region of the main magnetic pole layer overlapped with the sub-yoke layer is overlapped with the magnetic domain having the larger track-widthwise component.