Patent ID: 7475471
Filing Date: 2009-01-13
Classification: B82Y,G11B,Y10T

Abstract:
1. A method for fabricating a magnetic head comprising: fabricating a plurality of thin film layers to create a read sensor, said read sensor including a first insulation (G1) layer, a pinned layer, a pinning layer, a spacer layer, a free magnetic layer having a midplane thereof, and a cap layer; milling said plurality of thin films such that a central sensor region is protected from milling and unprotected outer regions are milled down to said G1 layer, such that said free magnetic layer is formed with a central portion and outwardly disposed side edge portions; fabricating a hard bias structure upon said G1 layer at said outer regions such that said hard bias structure is disposed proximate said side edge portions of said free magnetic layer, said hard bias structure including a first seed layer, a second seed layer and a hard bias layer, wherein said hard bias structure is fabricated by; depositing said first seed layer upon said G1 layer; removing an upper portion of said first seed layer to create an upper surface of said first seed layer; depositing said second seed layer upon said upper surface of said first seed layer; depositing hard bias material upon said second seed layer to create the hard bias layer that is disposed upon said second seed layer; and wherein said hard bias layer has a midplane that is disposed at a horizontal level within the magnetic head that is approximately coplanar with said midplane of said free magnetic layer.