Method of producing flux guides in magnetic recording heads
View Patent ↗A flux guide protected magnetoresistive sensor in a tape drive read/write head is presented. The magnetoresistive sensor has a tape bearing surface, and includes a magnetoresistive sensing element and a flux guide disposed on a surface of the magnetoresistive sensing element to form a portion of the tape bearing surface.
1. A magnetoresistive sensor in a tape drive read head having a tape bearing surface, comprising:
a magnetoresistive sensing element; and
a flux guide disposed on a surface of the magnetoresistive sensing element to form a portion of the tape bearing surface,
wherein the surface is sloped with respect to the normal of the plane of the magnetoresistive sensing element, and
wherein the flux guide maintains a single domain state, and the flux guide is disposed on the same level as, and in physical contact with, the magnetoresistive sensing element.
2. The magnetoresistive sensor of claim 1 wherein the magnetoresistive sensing element comprises a giant magnetoresistive (GMR) element.
3. The magnetoresistive sensor of claim 2 wherein the GMR element comprises a bottom spin valve GMR element.
4. The magnetoresistive sensor of claim 2 wherein the GMR element comprises a top spin valve GMR element.
5. The magnetoresistive sensor of claim 2 wherein the GMR element includes a synthetic antiferromagnetic layer.
6. The magnetoresistive sensor of claim 2 wherein the GMR element includes a spacer layer, an antiferromagnetic exchange layer and a pinned layer, and wherein the flux guide covers the surface of the GMR element to the extent that the flux guide prevents exposure of the spacer, antiferromagnetic exchange and pinned layers on the tape bearing surface.
7. The magnetoresistive sensor of claim 1 wherein the flux guide comprises a permeable material.
8. The magnetoresistive sensor of claim 7 wherein the permeable material comprises a nickel-iron alloy.
9. The magnetoresistive sensor of claim 1 wherein the magnetoresistive sensing element comprises an anisotropic magnetoresistive (AMR) element.
10. The magnetoresistive sensor of claim 1 , wherein the magnetoresistive sensing element maintains a single domain state.
11. A head for use in a tape drive, comprising:
a write head portion; and
a read head portion, the read head portion including a magnetoresistive sensor having a tape bearing surface;
the magnetoresistive sensor comprising a magnetoresistive sensing element and a flux guide disposed on a surface of the magnetoresistive sensing element to form a portion of the tape bearing surface of the magnetoresistive sensor,
wherein the surface is sloped with respect to the normal of the plane of the magnetoresistive sensing element, and
wherein the flux guide maintains a single domain state, and the flux guide is disposed on the same level as, and in physical contact with, the magnetoresistive sensing element.
12. The head of claim 11 wherein the magnetoresistive sensing element comprises a giant magnetoresistive (GMR) element.
13. The head of claim 12 wherein the GMR element comprises a bottom spin valve GMR element.
14. The head of claim 12 wherein the GMR element comprises a top spin valve GMR element.
15. The head of claim 12 wherein the GMR element includes a synthetic antiferromagnetic layer.
16. The head of claim 12 wherein the GMR element includes a spacer layer, an antiferromagnetic exchange layer and a pinned layer, and wherein the flux guide covers the surface of the GMR element to the extent that the flux guide prevents exposure of the spacer, antiferromagnetic exchange and pinned layers on the tape bearing surface.
17. The head of claim 11 wherein the flux guide comprises a permeable material.
18. The head of claim 17 wherein the permeable material comprises a nickel-iron alloy.
19. The head of claim 11 wherein the magnetoresistive sensing element comprises an anisotropic magnetoresistive (AMR) element.
20. The head of claim 11 , wherein the magnetoresistive sensing element maintains a single domain state.
21. A tape drive comprising:
a magnetic tape;
a read head to read information recorded on a magnetic tape;
a magnetoresistive sensor in the read head, the magnetoresistive sensor having a tape bearing surface; and
the magnetoresistive sensor comprising a magnetoresistive sensing element and a flux guide disposed on a surface of the magnetoresistive sensing element to form a portion of the tape bearing surface of the magnetoresistive sensor,
wherein the surface is sloped with respect to the normal of the plane of the magnetoresistive sensing element, and
wherein the flux guide maintains a single domain state, and the flux guide is disposed on the same level as, and in physical contact with, the magnetoresistive sensing element.
22. The tape drive of claim 21 wherein the magnetoresistive sensor is a GMR element.
23. The tape drive of claim 22 wherein the GMR element includes a spacer layer, an antiferromagnetic exchange layer and a pinned layer, and wherein the flux guide covers the surface of the GMR element to the extent that the flux guide prevents exposure of the spacer, antiferromagnetic exchange and pinned layers on the tape bearing surface.
24. The tape drive of claim 21 , wherein the magnetoresistive sensing element maintains a single domain state.
25. A method of manufacturing a thin film read head comprising:
providing a GMR film to a surface of a read gap insulating layer;
processing the GMR film to produce a GMR sensing element having a flux guide disposed thereon, the flux guide forming a portion of a tape bearing surface of the thin film read head,
wherein the surface is sloped with respect to the normal of the plane of the magnetoresistive sensing element, and
wherein the flux guide maintains a single domain state, and the flux guide is disposed on the same level as, and in physical contact with, the magnetoresistive sensing element.
26. The method of claim 25 wherein the flux guide comprises a nickel-iron alloy material.
27. The method of claim 25 , wherein the GMR sensing element maintains a single domain state.