Patent ID: 8225488
Filing Date: 2012-07-24
Classification: G11B,Y10T

Abstract:
1. A method for providing a perpendicular magnetic recording (PMR) pole in a magnetic recording transducer including an intermediate layer having a surface, the method comprising: providing a mask on the intermediate layer, the mask including a line having at least one side; providing a hard mask on the mask, a first portion of the hard mask residing on the at least one side and a second portion of the hard mask residing on the surface of the intermediate layer, the hard mask including a dry-etchable layer and a high removal ratio layer on the dry-etchable layer; removing at least part of the first portion of the hard mask, at least a portion of the line being exposed, the high removal ratio layer having a low angle removal rate on the at least one side and a high angle removal rate on the surface of the intermediate layer, the low angle removal rate being greater than the high angle removal rate; removing the line, thereby providing an aperture in the hard mask corresponding to the line; forming a trench in the intermediate layer under the aperture using a removal process, the trench having a bottom and a top wider than the bottom, the dry-etchable layer having a selectivity greater than ten during the removal process; and providing the PMR pole, at least a portion of the PMR pole residing in the trench.