Write head for improved manufacturability larger write field and reduced adjacent track erasure
View Patent ↗A magnetic write head provides a significant write field and minimal adjacent track erasure, and lends itself to improved manufacturability. The write head includes a pedestal throat height that defines a bottom pole, P 1 , and that is substantially recessed from the air bearing surface. The write head further includes a top pole, P 2 , that defines a nose that is closer to the air bearing surface than the pedestal zero throat. This design achieves a relatively high ratio of the off-track to on-track field. As an example, a 1:4 ratio could be achieved to significantly mitigate the erasure problem of the adjacent tracks resulting from magnetic flux saturation.
1. A write head for use in a data storage system, comprising:
a first pole layer, P 1 , made of magnetically soft material;
a pedestal formed on the first pole layer, P 1 , that defines a zero throat that lies in a plane generally parallel to an air bearing surface (ABS);
a second pole layer, P 2 , which defines a nose between the ABS and a flare position;
wherein the pedestal extends to the zero throat; and
wherein the flare position is closer to the air bearing surface than the zero throat.
2. The write head of claim 1 , wherein the zero throat is defined by a zero throat height, ZTH;
wherein the nose is defined by a nose length, NL; and
wherein the nose length, NL, is less than half the zero throat height, ZTH.
3. The write head of claim 2 , wherein the first pole layer, P 1 , extends from the air bearing surface to a back gap.
4. The write head of claim 3 , wherein the pedestal extends from the air bearing surface to the zero throat.
5. The write head of claim 4 , wherein the nose is defined by a nose length, NL that ranges between approximately 0.6 μm and approximately 1.3 μm.
6. The write head of claim 5 , wherein the nose is further defined by a nose width, nw, which, in turn, defines a track width.
7. The write head of claim 6 , wherein the pedestal is defined by a pedestal height, ph, that ranges between approximately 1.55 μm to approximately 3 μm.
8. The write head of claim 1 , further including a write coil.
9. The write head of claim 8 , wherein the write coil includes a plurality of multi-turn conductive coil elements to generate a desired write field.
10. The write head of claim 8 , wherein the write coil is formed of multiple layers.
11. A read/write head for use in a data storage system, comprising:
a read head; and
a write head comprised of:
a first pole layer, P 1 , made of magnetically soft material:
a pedestal formed on the first pole layer, P 1 , that defines a zero throat that lies in a plane generally parallel to on air bearing surface (ABS);
a second pole layer, P 2 , which defines a nose between the ABS and a flare position;
wherein the pedestal extends to the zero throat; and
wherein the flare position is closer to the air bearing surface than the zero throat.
12. The read/write head of claim 11 , wherein the zero throat is defined by a zero throat height, ZTH;
wherein the nose is defined by a nose length, NL; and
wherein the nose length, NL is less than half the zero throat height, ZTH.
13. The read/write head of claim 12 , wherein the first pole layer, P 1 , extends from the air bearing surface to a back gap.
14. The read/write head of claim 13 , wherein the pedestal extends from the air bearing surface to the zero throat.
15. The read/write head of claim 14 , wherein the nose is defined by a nose length, NL, that ranges between approximately 0.6 μm and approximately 1.3 μm.
16. The read/write head of claim 15 , wherein the nose is further defined by a nose width, nw, which, in turn, defines a track width.
17. The read/write head of claim 16 , wherein the pedestal is defined by a pedestal height, ph, that ranges between approximately 1.55 μm to approximately 3 μm.
18. The read/write head of claim 11 , further including a write coil.
19. The read/write head of claim 18 , wherein the write coil includes a plurality of multi-turn conductive coil elements to generate a desired write field.
20. The read/write head of claim 18 , wherein the write coil is formed of multiple layers.
21. A data storage system, comprising:
an arm;
a slider secured to the arm; and
a read/write head comprised of:
a read head; and
a write head comprised of:
a first pole layer, P 1 , made of magnetically soft material;
a pedestal formed on the first pole layer, P 1 , that defines a zero throat that lies in a plane generally parallel to on air bearing surface (ABS);
a second pole layer, P 2 , which defines a nose between the ABS and a flare position;
wherein the pedestal extends to the zero throat; and
wherein the flare position is closer to the air bearing surface than the zero throat.
22. The data storage system of claim 21 , wherein the zero throat is defined by a zero throat height, ZTH;
wherein the nose is defined by a nose length, NL; and
wherein the nose length, NL is less than half the zero throat height, ZTH.
23. The data storage system of claim 22 , wherein the first pole layer, P 1 , extends from the air bearing surface to a back gap.
24. The data storage system of claim 23 , wherein the pedestal extends from the air bearing surface to the zero throat.
25. The data storage system of claim 24 , wherein the nose is defined by a nose length, NL, that ranges between approximately 0.6 μm and approximately 1.3 μm.
26. The data storage system of claim 25 , wherein the nose is further defined by a nose width, nw, which, in turn, defines a track width.
27. The data storage system of claim 26 , wherein the pedestal is defined by a pedestal height, ph, that ranges between approximately 1.55 μm to approximately 3 μm.
28. The data storage system of claim 21 , further including a write coil.
29. The data storage system of claim 28 , wherein the write coil includes a plurality of multi-turn conductive coil elements to generate a desired write field.
30. The data storage system of claim 28 , wherein the write coil is formed of multiple layers.