Patent ID: 7382578
Filing Date: 2008-06-03
Classification: G11B

Abstract:
1. A thin film magnetic head, comprising: a thin film coil generating a magnetic flux; and a magnetic pole layer extending from a recording-medium-facing surface facing a recording medium moving to a medium travel direction to the rear, emitting the magnetic flux generated in the thin film coil to the recording medium, and having a planar shape which includes a uniform width region determining the recording track width of the recording medium and having a uniform width and a widening region having a width larger than that of the uniform width region, wherein the magnetic pole layer has a laminate structure in which an auxiliary magnetic pole layer extending from a first widening position where the width of the magnetic pole layer expands from the uniform width region to the widening region to the rear, and determining a planar shape of the widening region, and a main magnetic pole layer extending from the recording-medium-facing surface to the rear on the medium travel direction of the auxiliary magnetic pole layer, including a first magnetic pole layer portion extending from the recording-medium-facing surface to the rear through the first widening position and a second magnetic pole layer portion having a width larger than that of the first magnetic pole layer portion in order from the recording-medium-facing surface, and determining a planar shape of the uniform width region are laminated in this order.