Patent ID: 7433152
Filing Date: 2008-10-07
Classification: G11B

Abstract:
1. A perpendicular magnetic recording head, comprising: a thin film coil generating a magnetic flux; a pole layer extending from an air bearing surface facing a recording medium to the rear, and guiding the magnetic flux to the recording medium so that the recording medium is magnetized in a direction orthogonal to a surface of the recording medium; and a magnetic layer extending from the air bearing surface to the rear on a trailing side of the pole layer, the magnetic layer being separated from the pole layer by a gap layer on a side closer to the air bearing surface, and being connected to the pole layer on a side farther from the air bearing surface, wherein the pole layer includes; a main pole layer extending from the air bearing surface to the rear on a leading side; and an auxiliary pole layer extending from a position at the rear of the air bearing surface to the rear on a trailing side, and in the pole layer, the main pole layer and the auxiliary pole layer are laminated, wherein the width of the exposed surface exposed to the air bearing surface on a trailing side of the main pole layer in a recording track width direction is 0.2 μm or less, and the square measure of the exposed surface exposed to the air bearing surface of the magnetic layer is 7 μm a relationship of Y≧{12.6/[9000×10