Patent ID: 8045291

Claim:
A perpendicular magnetic recording head, comprising: a main magnetic pole layer exposed to an opposing surface opposite a recording medium, applying a perpendicular recording magnetic field to the recording medium; a return yoke layer disposed in above or below the main magnetic pole layer, the return yoke layer receiving the recording magnetic field returning thereto after passing through the recording medium; and a planarized nonmagnetic layer filling the surroundings of the return yoke layer, wherein the return yoke layer has two side surfaces and a front end surface positioned between the two side surfaces, the front end surface being formed in the opposing surface; wherein a width between the two side surfaces increases as a distance from the front end surface increases; and wherein a cohesive layer is disposed between the return yoke layer and the planarized nonmagnetic layer to increase the cohesive properties between the return yoke layer and the planarized nonmagnetic layer compared with the case in which the return yoke layer is directly connected to the planarized nonmagnetic layer.