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Shallow Trimmed Write Head and Rapid Method for Making the Same

IP.com Disclosure Number: IPCOM000013633D
Original Publication Date: 2000-Dec-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Abstract

Described is a magnetic recording head write structure that has a narrow top pole (P2) width in proximity to the air bearing surface (ABS), but a wider P2 width recessed only by a distance sufficiently far from the ABS to prevent any flux emanating therefrom writing a magnetic recording medium, viz. a shallow trimmed write head. Also described are rapid manufacturing methods for making the same that are particularly cost effective. As areal information densities rise, decreasing track widths are required to pack more information recorded onto magnetic recording media which places ever increasing demands on the P2 base (P2B) width of the write head structure of magnetic recording heads. One promising method for producing heads with the requisite track widths is to ion mill the P2B dimension. However, extensive ion milling is not required to recess portions of the P2 pole tip on either side of the P2 base sufficiently far away from the ABS so that flux emanating therefrom is incapable of writing a magnetic recording medium. Two advantages attend the use of such a shallower recess: first, P2 material in close proximity to the ABS and the actively writing portions of the P2 pole tip provides an additional conduit for flux to the actively writing portions of the P2 pole tip, i.e., the shallow recessed portions act as a flux guide to the actively writing portions of the P2 pole tip; second, since less material is removed from a shallow recess, the milling times required to recess the non-writing portions of the P2 pole tip are significantly reduced. The later advantage is particularly important for ion milling processes such as focused ion beam (FIB) milling wherein the time required to mill each individual head in a row of heads is a significant portion of the total processing time for a pallet of rows. Half or more of the time of processing can be due to milling to recess the P2, and a design with a shallow recess can reduce this time by orders of magnitude more than doubling the throughput of the FIB tool which substantially reduces the cost of producing a head with a trimmed write structure. A preferred, first embodiment of the invention comprises a magnetic recording head write structure having a write head element with a bottom pole (P1) separated from a top pole (P2) by a write gap (G3); having sides of the P2 milled to reduce the width of the P2 base to a narrower P2B dimension as determined by a track width for a given areal density, and recessed from the ABS by a distance just sufficient to lower the magnetic flux density emanating from the recessed portions at a recording medium below a level whereby the recording medium can be written. A second embodiment comprises a magnetic recording head write structure as described above wherein the bottom P1 pole is notched along lines extending vertically downward by greater than one G3 gap dimension from the trimmed P2 pole to produce a reduced lateral dimension of the P1 pole essentially equal to that of the P2 pole, the P2B dimension, and recessed from the ABS by a distance just sufficient to lower the magnetic flux density emanating from the recessed portions at a recording medium below a level whereby the recording medium can be written. A preferred embodiment for making the same comprises a method for producing the structures of the above embodiments by use of focused ion beam (FIB) milling at row or head level to remove material from P2 and P1 to produce a reduced P2B dimension, and to recess the milled away portions from the ABS. These embodiments should not be construed to preclude such embodiments as ion-milling at row level through a photoresist mask disposed and shaped to allow milling away the sides of the P2 and P1, and recessing the milled away portions from the ABS, or other similar embodiments which would be obvious to those skilled in the art.

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Shallow Trimmed Write Head and Rapid Method for Making the Same

   Described is a magnetic recording head write structure that has a narrow top pole (P2) width in proximity to the air bearing surface (ABS), but a wider P2 width recessed only by a distance sufficiently far from the ABS to prevent any flux emanating therefrom writing a magnetic recording medium, viz. a shallow trimmed write head. Also described are rapid manufacturing methods for making the same that are particularly cost effective.

   As areal information densities rise, decreasing track widths are required to pack more information recorded onto magnetic recording media which places ever increasing demands on the P2 base (P2B) width of the write head structure of magnetic recording heads. One promising method for producing heads with the requisite track widths is to ion mill the P2B dimension. However, extensive ion milling is not required to recess portions of the P2 pole tip on either side of the P2 base sufficiently far away from the ABS so that flux emanating therefrom is incapable of writing a magnetic recording medium. Two advantages attend the use of such a shallower recess: first, P2 material in close proximity to the ABS and the actively writing portions of the P2 pole tip provides an additional conduit for flux to the actively writing portions of the P2 pole tip, i.e., the shallow recessed portions act as a flux guide to the actively writing portions of the P2 pole tip; second, since less material is removed from a shallow recess, the milling times required to recess the non-writing portions of the P2 pole tip are significantly reduced. The later advantage is particularly important for ion milling processes such as focused ion beam (FIB) milling wherein the time required to mill each individual head in a row of heads is a significant portion of the total processing time for a pallet of rows. Half or more of the time of processing can be due to milling to recess the P2, and a design with a shallow...