Magnetic recording heads with bearing surface protections and methods of manufacture
View Patent ↗In one aspect described herein, a read head having one or more magnetoresistive (MR) sensors (or devices) is provided. In one example, the read head includes an MR sensor and an insulator layer disposed at the same level as the MR sensor. The read head further includes a bearing surface, wherein the insulator layer forms a portion of the bearing surface and is disposed between a surface of the MR sensor and the bearing surface to provide protection for the MR sensor from exposure to the bearing surface. The MR sensor may include a stack of thin-film layers to form an AMR, GMR, or TGMR sensor element. The stack may further include a slanted surface portion, wherein the insulator layer is disposed on the slanted surface portion, thereby recessing the MR sensor from the bearing surface.
1. A magnetoresistive read head having a bearing surface for contacting a magnetic storage medium, comprising:
a magnetoresistive sensor that is disposed between a first read gap layer and a second read gap layer, the magnetoresistive sensor having a slanted surface that faces the bearing surface, the slanted surface including a portion that is nearest the bearing surface; and
an insulator layer that contacts the slanted surface and is positioned directly between the portion of the magnetoresistive sensor that is nearest the bearing surface and the bearing surface, the insulator layer providing protection for the magnetoresistive sensor from exposure to the bearing surface.
2. The magnetoresistive read head of claim 1 , wherein the slanted surface is angled between 5 and 30 degrees.
3. The magnetoresistive read head of claim 1 , wherein the insulator layer protects the slanted surface facing the bearing surface from corrosion.
4. The magnetoresistive read head of claim 1 , wherein the magnetoresistive sensor is substantially free of oxide encroachment.
5. The magnetoresistive read head of claim 1 , wherein the insulator layer is disposed at the same level as the magnetoresistive sensor.
6. The magnetoresistive read head of claim 1 , wherein the insulator layer prevents exposure of at least a portion of the magnetoresistive sensor to the bearing surface.
7. The magnetoresistive read head of claim 1 , wherein a portion of the magnetoresistive sensor is recessed from the bearing surface by a distance of 750 Å or less.
8. The magnetoresistive read head of claim 1 , wherein the insulator layer includes silicon dioxide.
9. The magnetoresistive read head of claim 1 , wherein the magnetoresistive sensor is a giant magnetoresistive sensor.
10. The magnetoresistive read head of claim 1 , wherein the magnetoresistive sensor is a tunneling giant magnetoresistive sensor.
11. The magnetoresistive read head of claim 1 , wherein the magnetoresistive sensor includes an insulator spacer and the insulator spacer is protected from smearing by the insulator layer.
12. The magnetoresistive read head of claim 1 , wherein a portion of the magnetoresistive sensor is recessed from the bearing surface by a distance between 100 and 400 Å.
13. The magnetoresistive read head of claim 1 , wherein the insulator layer is disposed over the entire slanted surface.
14. A magnetoresistive read head having a bearing surface for contacting a magnetic storage medium, the magnetoresistive read head comprising:
a magnetoresistive sensor including a slanted surface that faces the bearing surface, the slanted surface including a portion that is nearest the bearing surface; and
an insulator layer disposed on the slanted surface directly between the portion of the magnetoresistive sensor that is nearest the bearing surface and the bearing surface, the insulator layer extending from the magnetoresistive sensor to the bearing surface.
15. The magnetoresistive read head of claim 14 , wherein a portion of the magnetoresistive sensor is recessed from the bearing surface by a distance of greater than 0 Å and less than 750 Å.
16. The magnetoresistive read head of claim 14 , wherein the slanted surface is angled approximately between 5 and 30 degrees.
17. The magnetoresistive read head of claim 14 , wherein the insulator layer is disposed at the same level as the magnetoresistive sensor.
18. The magnetoresistive read head of claim 14 , wherein the magnetoresistive sensor is a giant magnetoresistive sensor.
19. The magnetoresistive read head of claim 14 , wherein the magnetoresistive sensor is a tunneling giant magnetoresistive sensor.
20. The magnetoresistive read head of claim 14 , wherein the insulator layer is disposed over the entire slanted surface.