PROJECT TITLE :

Two-Dimensional Magnetic Recording With a Novel Write Precompensation Scheme for 2-D Nonlinear Transition Shift

ABSTRACT:

This paper proposes a novel write precompensation theme that adjusts this magnitude, not the timing, to mitigate the intense a pair of-D nonlinear transition shift (NLTS) throughout the shingled writing process during a two-dimensional magnetic recording (TDMR) system. This scheme calculates the required optimum write field for the current transition being written by subtracting the demagnetizing field produced by the previous written bits from a fixed write field and determines the optimum writing current based on the minimum mean-squared-error criterion between the needed field and the offered fields among a longtime field library. Such a write precompensation scheme is tested with a micromagnetic author and exchange coupled composite media, and readback with a rotated reader array combined with a scan channel. Simulation indicates that the proposed write precompensation technique will decrease bit error rate compared with the case without write precompensation and approach the performance of a system with negligible NLTS. Correspondingly, the utmost user areal density is increased from 3.two to four.1 Tbits/in $^mathrm mathbf 2$ for a TDMR system with 8 nm Voronoi grains due to the proposed write precompensation.