Patent ID: 7230794
Filing Date: 2007-06-12
Classification: G11B

Abstract:
1. A thin-film magnetic head comprising: a lower pole layer and a write gap layer; a first flattening layer, a coil pattern layer, and a second flattening layer which are laminated in order on the write gap layer excluding the vicinity of an ABS plane; an upper pole layer laminated on the write gap layer at least nearby the ABS plane; a concave portion which is formed on the lower pole layer at a position separated from the ABS, and is filled with a nonmagnetic body, and determines a gap depth between the upper pole layer and the lower pole layer; and a compensation element which compensates for an efficiency change due to the concave portion, wherein the compensation element is formed of a vacancy with a remaining part in an end portion at the ABS plane side of the lower pole layer, in which the vacancy reaches the margin at the ABS plane side of the concave portion from the ABS plane.