Patent ID: 9305583
Filing Date: 2016-04-05
CPC Classification: G11B

Claim Text:
1. A method for fabricating magnetic transducer having air-bearing surface (ABS) location, the method comprising: providing an etchable layer including a first sublayer in at least a side shield region and a second sublayer residing outside of the at least the side shield region, the side shield region including a portion of the ABS location, the second sublayer being different from the first sublayer; forming a trench in the etchable layer using a plurality of etches, a first etch of the plurality of etches removing a portion of the second sublayer and providing a first portion of the trench having a first sidewall angle with a down track direction, a second etch of the plurality of etches removing a portion of the first sublayer and providing a second portion of the trench having a second sidewall angle with the down track direction, the second sidewall angle being greater than the first sidewall angle, the second portion of the trench including an additional portion of the ABS location, the plurality of etches consisting of a plurality of reactive ion etches such that the trench is formed by the plurality of reactive ion etches, the first etch being a first reactive ion etch, the second etch being a second reactive ion etch; providing a main pole in the trench, the main pole having a plurality of sidewalls, the plurality of sidewalls having the second sidewall angle in the second portion of the trench and at least one main pole sidewall angle corresponding to the first sidewall angle in the first portion of the trench.