Patent ID: 8593761
Filing Date: 2013-11-26
Classification: G11B

Abstract:
1. A magnetic write head comprising: a main pole having a distal end that terminates in a pole tip at an ABS plane; a write shield, a trailing shield and a yoke, magnetically coupled to said main pole and completing a continuous flux circuit when a magnetic recording medium is present, wherein there is a corner point of contact (A) between said trailing shield and said yoke and wherein a yoke length (YL) is defined by a distance between said ABS and said corner point of contact; a driving coil situated over said yoke and having a vertically and horizontally aligned portion beneath said trailing shield and fitting vertically between said yoke and said trailing shield, wherein said portion fits horizontally between said ABS and said point of contact and a portion behind said point of contact; a bucking coil situated beneath said yoke and beneath said driving coil, wherein said bucking coil is electrically connected, by a vertical connector, in series to said driving coil but wound with an opposite polarity; wherein said driving coil is wound as a vertically rising series of sequentially connected horizontal partial spirals, wherein each partial spiral is in a horizontal plane that is vertically separated from other partial spirals and wherein said partial spirals are sequentially connected by vertical conducting links, forming a vertically rising, electrically continuous helical shape wrapping around said yoke as a series of connected rising partial spiral turns; and wherein said bucking coil is wound either vertically, as a mirror image helical formation of said driving coil as projected through the horizontal plane of said yoke, or is wound as a “pancake” in a single horizontal spiral formation.