Claims
- 1. A magnetic data storage and retrieval system comprising:
a magnetic head having a substrate and a data transducer positioned upon the substrate, the data transducer comprising a plurality of metallic layers, each of the plurality of metallic layers being formed of a material having a coefficient of thermal expansion greater than a coefficient of thermal expansion of a material forming the substrate; and means for compensating a thermally-caused expansion of at least one metallic layer of the plurality of metallic layers, the means positioned adjacent and substantially parallel to a metallic layer.
- 2. The magnetic data storage and retrieval system of claim 1 wherein the means for compensating is formed of a material having a coefficient of thermal expansion less than the coefficient of thermal expansion of the material forming the substrate.
- 3. The magnetic data storage and retrieval system of claim 2 wherein the means for compensating is formed of a material selected from the group consisting of W, Ru, Mo, Cr, Si, Ta, Zr, Hf, Os, Ge, Re, C, Ta, Ce, B, Ir, alloys including significant atomic percentage of the previous elements, NiFe, TiW, BN, silicon oxides, silicon nitrides, silicon oxide nitrides, silicon carbides, aluminum nitrides, aluminum oxides, aluminum oxide nitrides, zinc oxides, tungsten carbides, aluminum antimorrides, aluminum arsenide, cadmium selenides, cadmium sulfides, cadmium tellurides, gallium antimorrides, gallium arsenides, gallium phosphide, indium antimorrides, indium arsenide, indium phosphide, mercury tellurides, and copper gallium selenides.
- 4. The magnetic data storage and retrieval system of claim 1 wherein the means for compensating is positioned between the substrate and the data transducer.
- 5. The magnetic data storage and retrieval system of claim 1, and further comprising a basecoat positioned between the substrate and the data transducer.
- 6. The magnetic data storage and retrieval system of claim 5 wherein the means for compensating is positioned between the basecoat and the data transducer.
- 7. The magnetic data storage and retrieval system of claim 6 wherein the means for compensating are positioned upon the data transducer.
- 8. The magnetic data storage and retrieval system of claim 1 wherein the data transducer is comprised of a reader positioned upon the substrate and a writer positioned upon the reader, the means for compensating being positioned between the reader and the writer.
- 9. The magnetic data storage and retrieval system of claim 1, and further comprising an overcoat positioned upon the data transducer wherein the means for compensating is positioned upon the overcoat.
- 10. The magnetic data storage and retrieval system of claim 1 wherein the means for compensating is exposed at an air bearing surface of the magnetic head.
- 11. The magnetic data storage and retrieval system of claim 1 wherein the means for compensating is recessed from an air bearing surface of the magnetic head by no more than 10 microns.
- 12. A magnetic head having an air bearing surface and comprising:
a substrate; a data transducer positioned upon the substrate adjacent the air bearing surface, the data transducer comprising a plurality of metallic layers; and a compensation structure positioned adjacent to at least one of the plurality of metallic layers, the compensation structure positioned adjacent and substantially parallel to a metallic layer wherein the compensation structure is formed of a material having a coefficient of thermal expansion less than a coefficient of thermal expansion of a material forming the substrate.
- 13. The magnetic head of claim 12 wherein the compensation structure is positioned between the substrate and the data transducer.
- 14. The magnetic head of claim 12, and further comprising a basecoat positioned between the substrate and the data transducer.
- 15. The magnetic head of claim 14 wherein the compensation structure is positioned between the basecoat and the data transducer.
- 16. The magnetic head of claim 15 and further comprising a second compensation structure is positioned upon the data transducer.
- 17. The magnetic head of claim 12 wherein the compensation structure is exposed at the air bearing surface.
- 18. The magnetic head of claim 12 wherein the compensation structure is recessed from the air bearing surface by no more than 10 microns.
- 19. The magnetic head of claim 18, and further comprising a filler material deposited between the recessed compensation structure and the air bearing surface.
- 20. The magnetic head of claim 12 wherein the data transducer comprises.
a bottom shield; a shared pole comprising a top shield and a bottom pole; a top pole separated from the bottom pole at the air bearing surface by a write gap and in contact with the bottom pole opposite the air bearing surface; a conductive coil arranged such that at least a portion of the conductive coil is positioned between the bottom and top poles; and a coil insulator positioned between the bottom and top poles for insulating the conductive coil therefrom.
- 21. The magnetic head of claim 20 wherein the compensation structure is positioned between the top shield and the bottom pole.
- 22. The magnetic head of claim 20 wherein the compensation structure forms the coil insulator.
- 23. The magnetic head of claim 12 wherein the compensation structure is formed of a material selected from the group consisting of W, Ru, Mo, Cr, Si, Ta, Zr, Hf, Os, Ge, Re, C, Ta, Ce, B, Ir, alloys including significant atomic percentage of the previous elements, NiFe, TiW, BN, silicon oxides, silicon nitrides, silicon oxide nitrides, silicon carbides, aluminum nitrides, aluminum oxides, aluminum oxide nitrides, zinc oxides, tungsten carbides, aluminum antimorrides, aluminum arsenide, cadmium selenides, cadmium sulfides, cadmium tellurides, gallium antimorrides, gallium arsenides, gallium phosphide, indium antimorrides, indium arsenide, indium phosphide, mercury tellurides, and copper gallium selenides.
- 24. A magnetic head having an air bearing surface and comprising:
a substrate; a data transducer positioned upon the substrate and including a plurality of metallic layers, the data transducer comprising:
a reader positioned upon the substrate; a writer positioned upon the reader; and a compensation layer exposed at the air bearing surface and extending away from the air bearing surface, the compensation layer being formed of a material having a coefficient of thermal expansion less than a coefficient of thermal expansion of a material forming the substrate.
- 25. The magnetic head of claim 24 wherein the compensation layer is positioned between the substrate and the reader.
- 26. The magnetic head of claim 24, and further comprising a basecoat positioned between the substrate and the reader.
- 27. The magnetic head of claim 26 wherein the compensation layer is positioned between the basecoat and the reader.
- 28. The magnetic head of claim 24 wherein a second compensation layer is positioned upon the writer.
- 29. The magnetic head of claim 24 wherein the compensation layer is positioned between the reader and the writer.
- 30. The magnetic head of claim 24, and further comprising an overcoat positioned upon the data transducer.
- 31. The magnetic head of claim 30 wherein the compensation layer is positioned upon the overcoat.
- 32. The magnetic head of claim 24 wherein the compensation layer is positioned upon the writer.
- 33. The magnetic head of claim 24 wherein the compensation layer is formed of a non-magnetic material.
- 34. The magnetic head of claim 24 wherein the compensation layer is formed of a conductive material.
- 35. The magnetic head of claim 24 the compensation layer is formed of a material selected from the group consisting W, Ru, Mo, Cr, Si, Ta, Zr, Hf, Os, Ge, Re, C, Ta, Ce, B, Ir, alloys including significant atomic percentage of the previous elements, NiFe, TiW, BN, silicon oxides, silicon nitrides, silicon oxide nitrides, silicon carbides, aluminum nitrides, aluminum oxides, aluminum oxide nitrides, zinc oxides, tungsten carbides, aluminum antimorrides, aluminum arsenide, cadmium selenides, cadmium sulfides, cadmium tellurides, gallium antimorrides, gallium arsenides, gallium phosphide, indium antimorrides, indium arsenide, indium phosphide, mercury tellurides, and copper gallium selenides.
- 36. The magnetic head of claim 24 wherein the compensation layer has a thickness between about 0.1 microns and about 50.0 microns.
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application claims priority from provisional application No. 60/395,019 filed Jul. 11, 2002, for “COMPENSATION SCHEMES TO REDUCE THERMAL POLE-TIP PROTRUSION/RECESSION IN MAGNETIC TRANSDUCERS” by Jie Zou, Jason Bryce Gadbois, Declan Macken, Michael Kautzky, David Christopher Seets, and Ladislav Rudolf Pust.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60395019 |
Jul 2002 |
US |