| US 7,576,950 B2 | ||
| Perpendicular magnetic recording head utilizing tensile stress to optimize magnetic pole layer domain structure | ||
| Naoto Matono, Saku (Japan) | ||
| Assigned to SAE Magnetics (H.K.) Ltd., Hong Kong (China) | ||
| Filed on Jul. 22, 2005, as Appl. No. 11/187,017. | ||
| Claims priority of application No. 2004-231312 (JP), filed on Aug. 06, 2004. | ||
| Prior Publication US 2006/0028763 A1, Feb. 09, 2006 | ||
| Int. Cl. G11B 5/31 (2006.01); G11B 5/23 (2006.01); G11B 5/39 (2006.01) | ||
| U.S. Cl. 360—119.02 [360/125.03; 360/317] | 4 Claims |
| 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.
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