Straight top main pole for PMR bevel writer
View Patent ↗A magnetic recording head includes a write pole comprising a throat region. The throat region includes a lower portion having a substantially trapezoidal cross-section, and an upper portion having a substantially rectangular cross-section. In a beveled region of the write pole, the substantially rectangular cross-section of the upper portion decreases in height towards an air bearing surface of the magnetic recording head.
1. A magnetic recording head having a write pole, the write pole comprising:
a throat region extending to an air bearing surface of the magnetic recording head, the throat region comprising:
a lower portion having a substantially trapezoidal cross-section at the air bearing surface; and
an upper portion having a rectangular cross-section at the air bearing surface,
wherein, in a beveled region of the write pole, the rectangular cross-section of the upper portion decreases in height towards the air bearing surface.
2. The magnetic recording head of claim 1 , wherein the substantially trapezoidal cross-section of the lower portion is substantially constant along a nose length of the throat region.
3. The magnetic recording head of claim 1 , wherein the beveled region extends from the air bearing surface of the magnetic recording head partway along a nose length of the throat region.
4. The magnetic recording head of claim 1 , wherein the beveled region comprises a substantially planar bevel defining an upper surface of the upper portion of the throat region.
5. The magnetic recording head of claim 4 , wherein the substantially planar bevel intersects the air bearing surface of the magnetic recording head within the upper portion of the throat region.
6. The magnetic recording head of claim 1 , wherein the upper section comprises substantially parallel side walls.
7. The magnetic recording head of claim 1 , further comprising:
a trailing shield disposed over the throat region of the write pole adjacent the air bearing surface.
8. The magnetic recording head of claim 7 , wherein the trailing shield has a lower surface conformal with a bevel of an upper surface of the upper portion of the throat region.
9. The magnetic recording head of claim 1 , further comprising:
first and second side shields on opposing sides of the throat region adjacent the air bearing surface.
10. The magnetic recording head of claim 1 , wherein a width of the rectangular cross-section is about equal to a maximum width of the substantially trapezoidal cross-section of the lower portion and substantially constant along a nose length of the throat region.
11. The magnetic recording head of claim 10 , wherein the upper portion consists of a rectangular block shape having the beveled region.
12. The magnetic recording head of claim 11 :
wherein the beveled region comprises a substantially planar bevel that intersects the air bearing surface within the upper portion of the throat region, and
wherein the beveled region extends from the air bearing surface of the magnetic recording head partway along a nose length of the throat region.
13. The magnetic recording head of claim 12 , wherein the substantially trapezoidal cross-section of the lower portion is substantially constant along a nose length of the throat region.
14. The magnetic recording head of claim 13 , wherein the upper section comprises substantially parallel side walls.
15. The magnetic recording head of claim 14 , further comprising a trailing shield disposed over the throat region of the write pole adjacent the air bearing surface.
16. The magnetic recording head of claim 15 , wherein the trailing shield has a lower surface conformal with a bevel of an upper surface of the upper portion of the throat region.
17. The magnetic recording head of claim 16 , further comprising first and second side shields on opposing sides of the throat region adjacent the air bearing surface.