Electronic lapping guide in a magnetic recording transducer
View Patent ↗A slider includes a transducer including a magnetic structure having a front edge and a back edge. The slider further includes an electronic lapping guide (ELG) substantially coplanar with the magnetic structure and having a top edge and a bottom edge. The slider further includes a plurality of pads configured to calibrate a sheet resistance of the ELG and an offset of the ELG.
1. A slider comprising:
a transducer including a magnetic structure having a front edge and a back edge;
an electronic lapping guide (ELG) substantially coplanar with the magnetic structure and having a top edge and a bottom edge; and
a plurality of pads configured to calibrate a sheet resistance of the ELG and an offset of the ELG;
a plurality of windage test stripes having a plurality of windage lengths in a direction perpendicular to the front edge of the magnetic structure, the plurality of windage test stripes being separate from any transducer including the transducer;
wherein the plurality of pads is configured to be connected to a plurality of leads for the plurality of windage test stripes, the plurality of windage test stripes for determining the offset between the top edge of the ELG and the back edge of the magnetic structure.
2. The slider of claim 1 wherein the plurality of pads is configured to be connect to at least one Van der Pauw pattern corresponding to the ELG, the at least one Van der Pauw pattern for determining the sheet resistance of the ELG.
3. The slider of claim 1 wherein the transducer is a read transducer, the magnetic structure is a read sensor, and wherein the ELG is a read electronic lapping guide.
4. The slider of claim 3 further comprising:
a write transducer including a first pole, a main pole, and at least one coil for energizing the main pole, the main pole including a nose and a yoke;
a write electronic lapping guide (WELG) substantially coplanar with the main pole.
5. The slider of claim 1 wherein the transducer is a write transducer, the magnetic structure is a pole and wherein the ELG is a write electronic lapping guide.
6. The slider of claim 1 wherein the ELG is a tunneling magnetoresistive stripe.
7. The slider of claim 1 wherein the plurality of windage test stripes are electrically isolated from the magnetic structure.
8. A slider comprising:
a transducer including a magnetic structure having a front edge and a back edge and a plurality of windage test stripes, the plurality of windage test stripes having a plurality of windage lengths in a direction perpendicular to the front edge of the magnetic structure, the plurality of windage test stripes being physically separated from the magnetic structure by a nonzero distance;
an electronic lapping guide (ELG) substantially coplanar with the magnetic structure and having a top edge and a bottom edge,
a plurality of pads configured to calibrate a sheet resistance of the ELG and an offset of the ELG;
wherein the plurality of pads is configured to be connected to a plurality of leads for the plurality of windage test stripes, the plurality of windage test stripes for determining the offset between the top edge of the ELG and the back edge of the magnetic structure.
9. The slider of claim 8 wherein the plurality of windage test stripes are electrically isolated from the magnetic structure.