Patent ID: 8542464

Claim:
A magnetic write head having an air bearing surface (ABS), comprising: on a substrate, a flat primary lower magnetic pole having a first length and first and second ends; at a separation distance over said lower magnetic pole, a flat upper magnetic pole having a second length that is greater than said first length whereby said upper pole has an end, that has a width, that projects beyond said lower pole only at said first end; said upper pole being magnetically connected to said lower pole at said second end; between said upper and lower poles, a field coil that is insulated from both said poles; a secondary lower pole having first and second parts; while maintaining a constant width, said first part extending upwards from said primary lower pole's first end to a first height; said second part extending laterally from said first part only towards said ABS in a plane normal to said ABS so as to be in alignment with said upper pole end; said second part also extending upwards to a second height above said lower pole that is greater than said first height; and said second part being separated from said upper pole by a layer of non-magnetic material, whereby it forms a write gap across which a longitudinal recording field suitable for recording data forms naturally, said second part having a width, at the write gap, equal to said upper pole width, whereby it defines a track width.