Method of measuring a bevel angle in a write head
View Patent ↗A method of measuring a bevel angle in a write pole comprises the step of providing a mask over a wafer containing the write pole. The mask has a first opening over the write pole and a second opening over a sacrificial region of the wafer. The sacrificial region comprises a same material as the write pole. The method further comprises the steps of performing a beveling operation on the write pole and the sacrificial region to form a first bevel in the write pole and a second bevel in the sacrificial region, and measuring an angle of the second bevel in the sacrificial region to determine the bevel angle of the write pole.
1. A method of measuring a bevel angle in a write pole, comprising the steps of:
providing a mask over a wafer containing the write pole and a proxy structure, the mask having a first opening over the write pole and a second opening over the proxy structure of the wafer, the proxy structure comprising a same material as the write pole;
performing a beveling operation on the write pole and the proxy structure to form a first bevel in the write pole and a second bevel in the proxy structure; and
measuring an angle of the second bevel in the proxy structure to determine an angle of the first bevel of the write pole.
2. The method according to claim 1 , wherein the angle of the second bevel in the proxy structure is substantially the same as the angle of the first bevel of the write pole.
3. The method according to claim 1 , wherein a first edge of the mask adjacent the first opening is substantially parallel to a second edge of the mask adjacent the second opening.
4. The method according to claim 3 , wherein the first bevel is formed in a region of the write pole shadowed by the first edge, and wherein the second bevel is formed in a region of the proxy structure shadowed by the second edge.
5. The method according to claim 3 , wherein the first edge is parallel to an air bearing surface of the write pole.
6. The method according to claim 1 , wherein the same material of the proxy structure and the write pole comprises a same layer of magnetic material.
7. The method according to claim 1 , wherein the first opening is on an opposite side of an air bearing surface than the second opening.
8. The method according to claim 1 , wherein the step of measuring the angle of the second bevel comprises milling a trench intersecting the second bevel and measuring the angle of the second bevel using scanning probe microscopy.
9. The method according to claim 1 , wherein the step of measuring the angle of the second bevel does not comprise milling a trench intersecting the second bevel.
10. The method according to claim 1 , wherein the step of performing the beveling operation comprises ion beam milling.
11. The method according to claim 1 , wherein the proxy structure is at least ten times wider than the write pole region.
12. The method according to claim 1 , wherein the mask comprises photoresist or alumina.
13. The method according to claim 1 , wherein the write pole is one of a plurality of write poles in the wafer.