| To achieve ultra-high density magnetic recording (our goal of 10 Gbit/in{dollar}sp2{dollar} by the end of the century), the design and fabrication of recording heads face several challenges: writing the ultra-high density magnetization patterns; faithfully reproducing these recordings; and coordinating components in a functional system. Magnetic recording transducer issues include higher spatial resolution, side writing and reading, and crosstalk between two adjacent conducting lead pairs. We introduce and design several novel head structures to achieve increased density along the track as well as across tracks. For high-density writing, we introduce high write-field-gradient heads to improve the write resolution and investigate the side-writing stray fields for trimmed and untrimmed heads which affect the achievable track density. For multiple head systems, we introduce a novel lead structure: a vertically stacked lead pair. This structure reduces inductive coupling of lead pairs by several orders of magnitude as compared to a conventional structure. With certain combinations of this structure and the conventional one, further cancellation can be made. We analyze the inductance of the whole transducer system which serves as a design tool for ultra-high density multiple head/multiple track systems. |
