Method and system for providing an improved hard bias structure
View Patent ↗A method and system for providing a hard bias structure include providing a seed layer for a hard bias structure. The seed layer has a lattice constant and a natural growth texture. The method and system further include depositing the hard bias layer for the hard bias structure on the seed layer. The natural growth texture of the seed layer corresponds to a texture for the hard bias layer. The hard bias layer has a bulk lattice constant. Providing the seed layer includes forming a first plasma of a first deposition gas configured to expand the seed layer lattice constant if the bulk lattice constant is greater than the seed layer constant. Depositing the hard bias layer further includes forming a second plasma of a second deposition gas configured to expand the bulk lattice constant if the seed layer lattice constant is greater than the bulk lattice constant.
1. A magnetic head comprising:
a seed layer for a hard bias layer, the seed layer having a seed layer lattice constant and a natural growth texture, wherein the seed layer comprises a first deposition gas configured to expand the lattice of the seed layer; and
a hard bias structure on the seed layer, the hard bias structure including a hard bias layer on the seed layer, the natural growth texture corresponding to a texture for the hard bias layer, the hard bias layer having a bulk lattice constant and including a second deposition gas therein, the first deposition gas being lighter than the second deposition gas;
wherein the seed layer lattice constant is less than the bulk lattice constant.
2. The magnetic head of claim 1 wherein the seed layer includes a bilayer including an amorphous layer and a body-centered cubic layer on the amorphous layer.
3. The magnetic head of claim 1 wherein the amorphous layer includes at least one of Ta, TaZr, B, FeCoB, and ZrCuB.
4. The magnetic head of claim 1 wherein the seed layer includes a body-centered cubic layer.
5. The magnetic head of claim 4 wherein the seed layer consists of the body-centered cubic layer.
6. The magnetic head of claim 4 wherein the body-centered cubic layer has a (110) natural growth texture.
7. The magnetic head of claim 1 wherein the seed layer includes at least one of CrTi, CrV, Cr, W, WCr, V, and NiAl.
8. The magnetic head of claim 1 wherein the first deposition gas includes a first gas that is lighter than xenon and inert with respect to the seed layer.
9. The magnetic head of claim 8 wherein the first gas is a noble gas.
10. The magnetic head of claim 1 wherein the seed layer includes not more than four atomic percent of the first deposition gas.
11. The magnetic head of claim 10 wherein the seed layer includes at least one and not more than two atomic percent of the first deposition gas.
12. The magnetic head of claim 1 wherein the hard bias layer includes at least one of CoPt, CoCrPt, and CoSm.
13. The magnetic head of claim 1 wherein the hard bias layer includes a material having a hexagonal close-packed crystal structure having a lattice constant that is not more than fifteen percent different from a CoPt lattice constant.
14. The magnetic head of claim 13 wherein the hexagonal structure lattice constant is not more than ten percent different from the CoPt lattice constant.
15. The magnetic head of claim 13 wherein the texture of the hard bias layer is a (10*0) texture.
16. A magnetic head comprising:
a seed layer for a hard bias layer, the seed layer having a seed layer lattice constant and a natural growth texture, the seed layer including a first deposition gas therein; and
a hard bias structure on the seed layer, the hard bias structure including a hard bias layer on the seed layer, the natural growth texture corresponding to a texture for the hard bias layer, the hard bias layer having a bulk lattice constant and comprising a second deposition gas configured to expand the lattice of the hard bias layer, the second deposition gas being lighter than the first deposition gas;
wherein the seed layer lattice constant is greater than the bulk lattice constant.
17. The magnetic head of claim 16 wherein the seed layer includes a bilayer including an amorphous layer and a body-centered cubic layer on the amorphous layer.
18. The magnetic head of claim 16 wherein the amorphous layer includes at least one of Ta, TaZr, B, FeCoB, and ZrCuB.
19. The magnetic head of claim 16 wherein the seed layer includes a body-centered cubic layer.
20. The magnetic head of claim 19 wherein the seed layer consists of the body-centered cubic layer.
21. The magnetic head of claim 19 wherein the body-centered cubic layer has a (110) natural growth texture.
22. The magnetic head of claim 16 wherein the seed layer includes at least one of CrTi, CrV, Cr, W, WCr, V, and NiAl.
23. The magnetic head of claim 16 wherein the second deposition gas comprises a second gas that is lighter than xenon and inert with respect to the seed layer.
24. The magnetic head of claim 23 wherein the second gas is a noble gas.
25. The magnetic head of claim 16 wherein the hard bias layer includes not more than four atomic percent of the second deposition gas.
26. The magnetic head of claim 16 wherein the hard bias layer includes at least one and not more than two atomic percent of the second deposition gas.
27. The magnetic head of claim 16 wherein the hard bias layer includes at least one of CoPt, CoCrPt, and CoSm.
28. The magnetic head of claim 16 wherein the hard bias layer comprises a material having a hexagonal close-packed crystal structure having a lattice constant that is not more than fifteen percent different from a CoPt lattice constant.
29. The magnetic head of claim 28 wherein the hexagonal structure lattice constant is not more than ten percent different from the CoPt lattice constant.
30. The magnetic head of claim 28 wherein the texture of the hard bias layer is a (10*0) texture.
31. A disk drive including a magnetic head comprising:
a seed layer for a hard bias layer, the seed layer having a seed layer lattice constant and a natural growth texture, wherein the seed layer comprises a first deposition gas configured to expand the lattice of the seed layer;
a hard bias structure on the seed layer, the hard bias structure including a hard bias layer on the seed layer, the natural growth texture corresponding to a texture for the hard bias layer, the hard bias layer having a bulk lattice constant and including a second deposition gas therein, the first deposition gas being lighter than the second gas;
wherein the seed layer lattice constant is less than the bulk lattice constant, and wherein the disk drive is configured to obtain information from a magnetic media using the magnetic head.
32. A disk drive including a magnetic head comprising:
a seed layer for a hard bias layer, the seed layer having a seed layer lattice constant and a natural growth texture, the seed layer having a first deposition gas therein;
a hard bias structure on the seed layer, the hard bias structure including a hard bias layer on the seed layer, the natural growth texture corresponding to a texture for the hard bias layer, the hard bias layer having a bulk lattice constant and comprising a second deposition gas configured to expand the lattice of the hard bias layer, the second deposition gas being lighter than the first deposition gas;
wherein the seed layer lattice constant is greater than the bulk lattice constant, and wherein the disk drive is configured to obtain information from a magnetic media using the magnetic head.