Magnetic recording write head with write pole having a tapered trailing end section with negative magnetic anisotropy

A perpendicular magnetic recording disk drive write head for magnetizing regions in data tracks of a magnetic recording layer on a disk, the write head being formed on a slider having a gas-bearing surface (GBS), the write head comprising:

• a write pole formed of ferromagnetic material and having an end substantially at the GBS;
• a trailing shield formed of ferromagnetic material and having an end substantially at the GBS, the write pole end and trailing shield end being spaced apart to define a write gap, wherein an along-track line on the write head is a line substantially orthogonal to the gap and substantially parallel to the GBS, and a cross-track line on the write head is a line substantially orthogonal to the along-track line and substantially parallel to the GBS;
• and
• a pair of ferromagnetic side shields, the side shields having ends for facing the disk and being spaced on opposite sides of the write pole end on the cross-track line to define side gaps;
• wherein the write pole further comprises a trailing portion having a taper adjacent the write gap, a non-trailing portion having no trailing taper, and a seed layer between the trailing portion and the non-trailing portion, the trailing portion having negative magnetic anisotropy and comprising a multilayer of alternating layers of Co and Fe.