Well use of space for low resistance coil design for write head
OwnerEdward Lee, Vladimir Nikitininventors
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Abstract
In one embodiment of the present invention, a write head includes a P2 pole tip, a back gap layer, and a first insulation layer applied on top and in between the P2 pole tip and the back gap layer. Coil, formed of copper, is developed on top of the first insulation layer and extends below the top of the P2 pole tip, a second insulation layer pancakes the coil to insulate it. A P3 magnetic layer is formed on top of the second insulation layer, the coil reducing coil resistance yet avoiding shorting with the P3 magnetic layer.
Claims36
A method of manufacturing a write head having a first and second layer coil wherein formation of the second layer coil comprising:
- applying a first insulation layer;
- baking the first insulation layer;
- applying a chemical mechanical polishing (CMP) process to level the first insulation layer;
- removing the leveled first insulation layer;
- depositing a coil photoresist layer into the coil spaces;
- plating copper on top of the deposited coil photoresist layer and between the P2 pole tip and the back gap layer to form a coil;
- applying a second insulation layer to insulate the plated copper;
- and
- sputtering a seed layer on top of the second insulation layer while avoiding exposure of the plated copper to a P3 magnetic layer.
A structure formed in a write head comprising:
- a P2 pole tip;
- a back gap layer;
- a first insulation layer applied on top and in between the P2 pole tip and the back gap layer;
- coil, formed of copper, and developed on top of the first insulation layer and extending below the top of the P2 pole tip;
- a second insulation layer pancaking the coil to insulate the same;
- and
- P3 magnetic layer formed on top of the second insulation layer, the coil reducing coil resistance yet avoiding shorting with the P3 magnetic layer.
A disc drive comprising:
- a write head including,
- a P2 pole tip;
- a back gap layer;
- a first insulation layer applied on top and in between the P2 pole tip and the back gap layer;
- coil, formed of copper, and developed on top of the first insulation layer;
- a second insulation layer pancaking the coil to insulate the same;
- and
- P3 magnetic layer formed on top of the second insulation layer, the coil having a height large enough to reduce coil resistance yet avoiding shorting with the P3 magnetic layer.
A structure formed in a write head comprising:
- a P2 pole tip;
- a back gap layer;
- a first insulation layer applied on top and in between the P2 pole tip and the back gap layer;
- coil, formed of copper, and developed on top of the first insulation layer and extending below the top of the P2 pole tip, said coil having an aspect ratio defined by a ratio of the height of the coil to the width of the coil, said aspect ratio being 1:1;
- a second insulation layer pancaking the coil to insulate the same;
- and
- P3 magnetic layer formed on top of the second insulation layer, the coil reducing coil resistance yet avoiding shorting with the P3 magnetic layer.
A structure formed in a write head comprising:
- a P2 pole tip;
- a back gap layer;
- a first insulation layer applied on top and in between the P2 pole tip and the back gap layer;
- coil, formed of copper, and developed on top of the first insulation layer;
- a second insulation layer pancaking the coil to insulate the same;
- and
- P3 magnetic layer formed on top of the second insulation layer, the conductivity of an area defined below the P3 magnetic layer and extending between the P2 pole tip and the back gap layer but not below the first insulation layer is 40-50%.
Dependencies are inferred from the claim text.