Read Rite Corporation

Western Digital (fremont), Inc.

Renuka Apparao

Zhupei Shi

Billy W Crue, Jr

Mark David Thomas

Mark Seymour

Ken Young

Wenjie Chen

Bill Crue

Sean Yao

A method of forming a head comprises forming a write transducer on a wafer, cutting the wafer to produce a slider bar with a cut surface, and planarizing the cut surface of the slider bar. Forming the write transducer can include forming a first pole layer and forming a first pole pedestal layer over the first pole layer, where the first pole pedestal layer includes a tapered portion defined by a first end having a nose width less than a desired final nose width, and a second end having a zero throat width greater than the desired final nose width. Planarizing the cut surface of the slider bar exposes the first pole pedestal layer until a width thereof approximately equals the desired final nose width.

Method of forming a magnetoresistive device

A magnetoresistive device having a first pole, a second pole, and a first tapered pole pedestal therebetween and magnetically connected to the second pole. The first tapered pole has a width that increases with increasing distance away from the air bearing surface, ABS. The magnetoresistive device can also include a second tapered pole pedestal magnetically connected to the first pole, and separated from the first tapered pole pedestal by a write gap. The second tapered pole pedestal has a width that increases with increasing distance away from the air bearing surface. A method of the present invention includes defining the trackwidth of a write element by lapping a tapered pole pedestal. More specifically, the trackwidth is given by a known taper angle, a zero throat width, and a throat height, wherein the throat height is controlled precisely by lapping.

The present invention provides a shared pole magnetic read/write head for achieving optimized erase band width and a method for fabricating same. It has been found that there exists a relationship between a quantity delta defined as the difference between the width of the first pole and the width of the second pole and the resultant erase band width. The method of the present invention optimizes the erase band width by adjusting the value of delta and results in a read/write head useful in circumstances where the servo does not require small erase bands such as those resulting from a self-aligned pole structure having equal widths. Additionally, the alignment of the second pole relative to the first pole is not of critical importance in the read/write head of the present invention, the first pole being wider than the second pole.

Shared pole magnetic read-write head for achieving optimized erase band width and method of fabricating the same

A write element for recording data on a magnetic medium includes a first pole and a second pole separated by a non-magnetic, electrically insulating write gap layer. In addition, a coil layer is recessed into the first pole and is electrically insulated from the first pole by a coil insulation layer, and form the second pole by a coil separation layer. The coil layer includes at least one coil turn, each of which are transversely separated from an adjacent coil turn by a coil turn divider. In some embodiments, the coil turn dividers are integral with and therefore formed of the same material as the first pole. The coil layer, first pole, and coil turn dividers are planarized before formation of the coil separation layer. Also, a second pole pedestal can be connected to the second pole at the air bearing surface, and separated from the first pole by the write gap layer. A highly heat conductive material can be disposed below the first pole as an undercoat. Such an undercoat can facilitate dispersion of heat that is generated by a current passing through the coil layer, away from other components of the write element. In addition, the write element can be formed in conjunction with a read element to form a read/write head. The read element can be formed above the write element, with the coil layer embedded in the first pole which is distal the read element.

Magnetic read/write device with insulated coil layer recessed into pole

A magnetoresistive write element having a greatly reduced stack height allowing construction of a smaller track width and tighter track width tolerances. The reduced stack height also produces improved magnetic flux flow properties in the write element leading to an improved magnetic fringing field in the write gap region The magnetoresistive write head includes an electrically conductive planar coil having a portion thereof extending between first and second poles. The first and second poles join one another to form a magnetic yoke which is closed at one end and open at the other. An insulation layer separates the coil from the first pole. Another layer of insulating material is formed into the coil, interspersed between the winds and having an upper surface which is flush with the upper surface of the coil. A thin layer of write gap material insulates the coil from the second pole. Since there is only a thin layer of write gap material between the coil and the second pole, rather than a thicker insulation layer, the topography of the second pole can be reduced. This lowers the stack height which allows the second pole to be constructed to define a smaller write gap with tighter tolerances.

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Fremont, CA, United States of America

Renuka Apparao