Patent ID: 7924528
Filing Date: 2011-04-12
Classification: G11B,Y10T

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 having an 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; a gap layer that is made of a nonmagnetic material, has an end face located in the medium facing surface, and is disposed between the pole layer and the shield; and a substrate on which the coil, the pole layer, the gap layer and the shield are stacked, the pole layer being disposed closer to the substrate than is the shield, wherein: the end face of the pole layer located in the medium facing surface has a first side closer to the substrate, and a second side opposite to the first side, the second side defining a track width; the pole layer has a top surface that is farther from the substrate; the top surface of the pole layer includes: a first portion having a first edge located in the medium facing surface and a second edge opposite thereto; and a second portion located farther from the medium facing surface than the first portion and connected to the first portion at the second edge, the first edge coinciding with the second side; a distance from the substrate to an arbitrary point on the first portion increases with increasing distance from the medium facing surface to the arbitrary point; the first portion has an angle of inclination with respect to a direction perpendicular to the medium facing surface, and the angle of inclination taken at the arbitrary point increases stepwise or continuously with increasing distance from the medium facing surface to the arbitrary point; the angle of inclination taken at the first edge is greater than zero degree; and the second portion extends in a direction substantially perpendicular to the medium facing surface.