Write pole shield having a low saturation magnetization layer
AssigneeSeagate Technology LLC
InventorsSwaraj Basu, Prim Gangmei, Angela Moore, Mark Anthony Gubbins, Beverley R. McConnell
Life of this patent
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Abstract
A recording head that includes a bearing surface and a write pole having a front surface that forms a portion of the bearing surface. The recording head also includes a side shield for the write pole. The side shield includes a low saturation magnetization cap layer having a front surface that forms a portion of the bearing surface. The side shield also includes a main side shield layer having a saturation magnetization that is higher than a saturation magnetization value of the low saturation magnetization cap layer.
Claims18
A write head comprising:
- a bearing surface;
- a write pole having a front surface that forms a portion of the bearing surface;
- a trailing edge shield above the write pole;
- a trailing edge shield gap layer between the trailing edge shield and the write pole;
- a bi-layered side shield for the write pole, the bi-layered side shield is positioned below the trailing edge shield and comprises a main side shield layer having a trailing surface bevel and a low saturation magnetization cap layer on the trailing surface bevel, the low saturation magnetization layer having a front surface that forms a portion of the bearing surface, the low saturation magnetization cap layer comprises a substantially horizontal portion at the bearing surface that is positioned below the trailing edge shield gap layer and is in contact with the trailing edge shield gap layer.
An apparatus comprising:
- a bearing surface;
- a write pole having a front surface that forms a portion of the bearing surface;
- and
- a side shield for the write pole, the side shield comprising:
- a low saturation magnetization cap layer having a front surface that forms a portion of the bearing surface;
- and
- a main side shield layer having a back step feature recessed behind the bearing surface and a trailing surface bevel on which the low saturation magnetization cap layer is disposed, the main side shield layer having a saturation magnetization that is higher than a saturation magnetization value of the low saturation magnetization cap layer, and a width of the back step feature is substantially equal to a width of the low saturation magnetization cap layer.
A write head comprising:
- a bearing surface;
- a write pole having a front surface that forms a portion of the bearing surface;
- a trailing edge shield above the write pole;
- a trailing edge shield gap layer between the trailing edge shield and the write pole;
- and
- a bi-layered side shield for the write pole, the bi-layered side shield is positioned below the trailing edge shield and comprises a cap layer and a main side shield layer, below the cap layer, having a back step feature in an upper portion of the main side shield layer, with a lower portion of the main side shield layer having an upper surface that comprises a bottom surface of the back step feature, the back step feature being recessed behind the bearing surface and having a width that is substantially equal to a width of the cap layer.
Dependencies are inferred from the claim text.