Patent ID: 7576950
Filing Date: 2009-08-18
Classification: G11B

Abstract:
1. A perpendicular magnetic recording head comprising: a thin film coil for generating a magnetic flux; a magnetic pole layer extending rearward from a recording-medium-facing surface which faces a recording medium traveling in a medium travel direction, emitting the magnetic flux generated by the thin film coil toward the recording medium, and having a tensile stress in the whole; and a nonmagnetic layer which buries the magnetic pole layer, thereby magnetically isolating the magnetic pole layer, and having a tensile stress at least in part of the nonmagnetic layer, wherein the magnetic pole layer specifies a recording track width of the recording medium, the nonmagnetic layer includes a first nonmagnetic layer part which is adjacent to the magnetic pole layer in a first direction in the medium travel direction, a second nonmagnetic layer part which is adjacent to the magnetic pole layer in a second direction opposite to the first direction, a third nonmagnetic layer part adjacent to the magnetic pole layer in a third direction in the recording track width direction, and a fourth nonmagnetic layer part adjacent to the magnetic pole layer in a fourth direction opposite to the third direction, and only the first and second nonmagnetic layer parts have a tensile stress.