Patent ID: 7933095
Filing Date: 2011-04-26
Classification: G11B

Abstract:
1. A magnetic head for perpendicular magnetic recording comprising: a medium facing surface that faces toward a recording medium; a coil for generating a magnetic field corresponding to data to be written on the recording medium; a pole layer having an end face located in the medium facing surface, the pole layer allowing a magnetic flux corresponding to the magnetic field generated by the coil to pass therethrough and generating a write magnetic field for writing the data on the recording medium by means of a perpendicular magnetic recording system; a shield made of a magnetic material; and a gap layer made of a nonmagnetic material, wherein: the shield includes a shield layer having a front end face located in the medium facing surface at a position forward of the end face of the pole layer along a direction of travel of the recording medium; the gap layer is disposed between the pole layer and the shield layer; and the end face of the pole layer located in the medium facing surface has a side adjacent to the gap layer, and this side defines a track width, the magnetic head further comprising a first stopper layer for suppressing protrusion of the front end face of the shield layer, the first stopper layer being disposed adjacent to the shield layer and made of a nonmagnetic material having a linear thermal expansion coefficient of 5×10