Patent ID: 8453316
Filing Date: 2013-06-04
Classification: B82Y,G01R,G11B,Y10T

Abstract:
1. A method of manufacturing a magnetic head, the magnetic head 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; and a pole layer having an end face located in the medium facing surface, allowing a magnetic flux corresponding to the field generated by the coil to pass therethrough, and generating a write magnetic field for writing the data on the recording medium, wherein: the pole layer has a first surface and a second surface that face toward opposite directions; the first surface has a first edge and a second edge that extend in a direction intersecting the medium facing surface; a space between the first and second edges in the medium facing surface defines a track width; the first edge includes a first straight portion that is located away from the medium facing surface; the second edge includes a second straight portion that is located away from the medium facing surface; and a space between the first and second straight portions increases as a distance from the medium facing surface increases; assuming that: an imaginary straight line that passes through an intersection point of the first edge and the medium facing surface and extends in a direction orthogonal to the medium facing surface is defined as L the straight line L forming a photoresist layer unpatterned; selectively exposing through the use of a photomask the photoresist layer unpatterned; forming a pattern for forming the pole layer by developing the photoresist layer after the exposure; forming the pole layer through the use of the pattern; and forming the coil, wherein: the photomask includes: a first region having such a perimeter that part of a projection image thereof is shaped along the first and second straight portions of the first surface of the pole layer to be formed; a second region touching the perimeter of the first region and located outside the first region; and a third region located inside the first region without touching the perimeter of the first region; and each of the second and third regions has a property different from that of the first region with regard to a property of allowing light for exposure to pass or intercepting light for exposure.