Advanced write heads for high density and high data rate recording

Abstract

Advanced write head designs improve write efficiency, by reducing yoke length to less than 15 μm, adapting a sunken coil/P1 pedestal structure with stitched pole, and utilizing high moment poles with greater than 2 Tesla moment. Sufficient bit-error rate was achieved up to 680 kBPI, using heads with 50-60 GB/in2 dimensions. For wider track width heads, spin-stand testing showed good writing parametrics and soft error rate up to 1.0-1.1 Gb/s channel data rate, with product electronics and channels. Feasibility of high-speed recording, up to 1.5 Gb/s is demonstrated using experimental write drivers.