Technique for reducing pole tip protrusion in a magnetic write head and GMR stripe temperature in an associated read head structure utilizing one or more internal diffuser regions
View Patent ↗A technique for reducing pole tip protrusion (“PTP”) in a magnetic write head and giant magnetoresistive (“GMR”) stripe temperature in an associated read head structure utilizing one or more internal diffuser regions. In a representative embodiment disclosed, this may be effectuated through the appropriate placement of a relatively highly conductive material diffuser region (e.g. gold (Au) or copper (Cu)) above the poles, between the first pole and the coil and/or through the first pole, second and first shields and undercoat layer to the substrate in order to conduct heat away from the write head poles, insulating layers (e.g. photoresist) and shields.
1. A write head comprising:
a coil;
a first pole in an underlying relationship to said coil;
a second pole in an overlying relationship to said coil;
at least one relatively high thermal conductivity diffuser region interposed between said coil and said first pole, wherein said at least one relatively high thermal conductivity diffuser region comprises an electrically conductive material; and
a write gap layer interposed between said coil and said at least one relatively high thermal conductivity diffuser region, whereby said at least one relatively high thermal conductivity diffuser region is not in contact with said coil.
2. The write head of claim 1 wherein said at least one relatively high thermal conductivity diffuser region extends through said first pole to contact a substrate of said write head.
3. The write head of claim 1 wherein said at least one relatively high thermal conductivity diffuser region comprises Au or Cu.
4. The write head of claim 1 further comprising:
another relatively high thermal conductivity diffuser region in an overlying relationship to said second pole.
5. The write head of claim 4 wherein said another relatively high thermal conductivity diffuser region comprises Au or Cu.
6. The write head of claim 1 further comprising:
an insulating layer substantially surrounding said coil.
7. The write head of claim 1 further comprising:
at least one shield layer in an underlying relationship with said first pole.
8. The write head of claim 1 further comprising:
at least one overcoat layer in an overlying relationship with said second pole.
9. The write head of claim 1 further comprising:
a pedestal layer overlying said first pole and substantially laterally surrounding said at least one relatively high thermal conductivity diffuser region.
10. The write head of claim 4 further comprising:
a midcoat layer in substitution for said at least one relatively high thermal conductivity diffuser region.
11. The write head of claim 4 further comprising:
a midcoat layer in substitution for said another relatively high thermal conductivity diffuser region.
12. A write head comprising:
a coil;
a first pole in an underlying relationship to said coil;
a second pole in an overlying relationship to said coil; and
at least one relatively high thermal conductivity diffuser region in an overlying relationship to said coil and said second pole, wherein said at least one relatively high thermal conductivity diffuser region comprises an electrically conductive material and wherein said at least one relatively high thermal conductivity diffuser region is spaced apart in said write head from both said coil and said second pole.
13. The write head of claim 12 wherein said at least one relatively high thermal conductivity diffuser region comprises Au or Cu.
14. The write head of claim 12 further comprising:
another relatively high thermal conductivity diffuser region interposed between said coil and said first pole.
15. The write head of claim 14 wherein said another relatively high thermal conductivity diffuser region comprises Au or Cu.
16. The write head of claim 12 said another relatively high thermal conductivity diffuser region extends through said first pole to contact a substrate of said write head.
17. The write head of claim 12 further comprising:
an insulating layer substantially surrounding said coil, the insulating layer being interposed at least partially between said second pole and said at least one relatively high thermal conductivity diffuser region.
18. The write head of claim 12 further comprising:
at least one shield layer in an underlying relationship with said first pole.
19. The write head of claim 12 further comprising:
at least one overcoat layer in an overlying relationship with said second pole.
20. The write head of claim 12 further comprising:
a pedestal layer overlying said first pole and substantially laterally surrounding said at least one relatively high thermal conductivity diffuser region.
21. A write head comprising:
a coil;
a first pole in an underlying relationship to said coil;
a second pole in an overlying relationship to said coil;
a midcoat layer interposed between said coil and said first pole; and
at least one relatively high thermal conductivity diffuser region interposed between said midcoat layer and extending through said first pole, wherein said at least one relatively high thermal conductivity diffuser region comprises an electrically conductive material; and a write gap laver interposed between said coil and said at least one relatively high thermal conductivity diffuser region, whereby said at least one relatively high thermal conductivity diffuser region is not in contact with said coil.
22. The write head of claim 21 wherein said at least one relatively high thermal conductivity diffuser region extends through said first pole to contact a substrate of said write head.
23. The write head of claim 21 wherein said at least one relatively high thermal conductivity diffuser region comprises Au or Cu.
24. The write head of claim 21 further comprising:
another relatively high thermal conductivity diffuser region in an overlying relationship to said second pole.
25. The write head of claim 24 wherein said another relatively high thermal conductivity diffuser region comprises Au or Cu.
26. The write head of claim 21 further comprising:
an insulating layer substantially surrounding said coil.
27. The write head of claim 21 further comprising:
at least one shield layer in an underlying relationship with said first pole, said at least one relatively high thermal conductivity diffuser region extending through said at least one shield layer.
28. The write head of claim 21 further comprising:
at least one overcoat layer in an overlying relationship with said second pole.
29. The write head of claim 21 further comprising:
a pedestal layer overlying said first pole and substantially laterally surrounding said at least one relatively high thermal conductivity diffuser region.