Method for manufacturing a perpendicular write head
View Patent ↗A method for manufacturing a write head having a small write pole tip that emits magnetic flux sufficient for effective perpendicular recording. The method creates a leading edge taper (LET) between the write pole tip and a magnetic flux guide to create a sufficient magnetic flux in the write pole. The LET is fabricated by ion milling away a sacrificial striated material whose layers have different rates of ion milling. The top layer of material thus mills away faster than lower layers, creating the required tapering of a negative mold. An endpoint material stops the milling. The LET magnetic material is then spattered into the negative mold, resulting in a well defined taper of magnetic flux shaping material extending the magnetic flux guide to the write pole tip, such that the write pole tip is able to emit sufficient magnetic flux for perpendicular recording.
1. A method for fabricating a write head, the method comprising:
laying an endpoint on a magnetic flux guide, the endpoint being resistant to milling;
laying a sacrificial edge taper on the flux guide, the sacrificial edge taper having layers of different materials that have different milling rates;
milling the sacrificial edge taper such that the different materials mill at different rates to create a desired angle for a negative mold; and
filling the negative mold with a magnetic material to form a final edge taper for guiding flux to a write pole near the edge taper.
2. The method of claim 1 , further comprising:
laying a P 3 layer against the final edge taper, the P 3 layer comprising a yoke joined to a write pole tip at a flare point, the write pole tip having a tip end that abuts an air bearing surface (ABS) of a disk, wherein a distance from the ABS to the flare point is the same as a combined thickness of the yoke and the final edge taper.
3. The method of claim 1 , wherein the milling is ion milling.
4. The method of claim 3 , wherein the endpoint resists ion milling.
5. The method of claim 4 , wherein the endpoint comprises a material from a group including rhodium, ruthenium, nickel chromium and copper.
6. The method of claim 1 , wherein the edge taper is a leading edge taper.
7. The method of claim 1 , further comprising:
layering a trailing edge taper (TET) on a trailing endpoint layer, the trailing endpoint adjacent the write pole; and
milling away the TET to create a taper point.
8. The method of claim 7 , wherein the trailing endpoint layer comprises layers of different materials that have different milling rates, thus producing a controlled tapered shape.
9. The method of claim 8 , wherein the taper point is between 40° and 50°.
10. The method of claim 8 , wherein the trailing endpoint layer comprises a material from a group including rhodium, ruthenium, nickel chromium and copper.