Distributed shunt structure for lapping of current perpendicular plane (CPP) heads
View Patent ↗An apparatus and method for lapping and fabricating a read/write head is described. The lapping method includes performing a first lapping process on a structure having the read/write head fabricated therein. The first lapping process is for reducing a first resistive region. The first resistive region is located proximal to a surface of the structure. The first lapping process is for achieving a first lapping benchmark. The lapping method further includes performing a second lapping process on a second resistive region. The second lapping process laps at a rate lesser than the first lapping process. The second lapping process is for achieving a second lapping benchmark. The second resistive region is interposed between the first resistive region and the read/write head. The second resistive region has a different resistive value than the second resistive region.
1. A method for lapping a read/write head comprising:
performing a first lapping process on a structure having said read/write head fabricated therein, said first lapping process providing a course lapping of a first resistive region of said structure, said first lapping process stopping after achieving a first lapping benchmark resistance; and
performing a second and final lapping process on said structure at a second resistive region to expose a sensor coupled with said read/write head, said second lapping process performing a finer lapping at a rate lesser than said first lapping process, said second lapping process stopping said lapping after an exponential increase in said sensor signal amplitude from said sensor coupled with said read/write head is detected, said second resistive region interposed between said first resistive region and said read/write head, said second resistive region having a higher resistive value that said first resistive region.
2. The method as recited in claim 1 further comprising:
ceasing said first lapping process upon reduction of said first resistive region to a desired volume.
3. The method as recited in claim 1 further comprising:
detecting an increase in a sensor amplitude signal during said second lapping, said increase indicating said second lapping benchmark.
4. The method as recited in claim 3 further comprising:
ceasing said second lapping upon said detecting said increase in said sensor amplitude signal.
5. The method as recited in claim 1 further comprising:
reducing handling induced electrostatic discharge to a sensor of said read/write head.
6. The method as recited in claim 1 further comprising:
decreasing lapping induced surface damage of a sensor of said read/write head.