Patent ID: 7493688

Claim:
A method for manufacturing a magnetic recording transducer comprising: providing a first pole having a front portion and a rear portion; providing a back gap on the rear portion of the first pole; providing an insulator on the first pole, a first portion of the insulator being adjacent to the back gap; providing a write gap, a portion of the write gap residing on the front portion of the first pole; providing a portion of a second pole on at least the write gap, a second portion of the insulator covering a remaining portion of the first pole between the portion of the second pole and the back gap; providing a mask covering the back gap and exposing the portion of the second pole and the insulator; and performing a pole trim for the portion of the second pole, wherein the mask has a mask removal rate during the pole trim, the portion of the second pole has a pole removal rate during the pole trim, the pole trim removes a removal thickness of the portion of the second pole, and the mask covering further includes: providing the mask having a mask thickness substantially equal to at least seventy percent of the removal thickness multiplied by the mask removal rate divided by the pole removal rate and not more than ninety percent of the removal thickness multiplied by the mask removal rate divided by the pole removal rate.