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Modeling and Simulation of the Writing Process on Bit-Patterned Perpendicular Media

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3 Author(s)
Muraoka, H. ; RIEC, Tohoku Univ., Sendai ; Greaves, S.J. ; Kanai, Y.

The recording physics of bit-patterned media is studied for areal densities of around 2 Tbits/inch2 . A model of the writing process, based on the head field gradient and switching field distribution, including various interference fields, is presented to extract the write-head and media parameters which are necessary to attain a wider write margin. Write head field distributions, calculated by the finite-element method, are presented for various head pole structures with side- and trailing-shields to improve head field gradient. Optimization of the pole configuration increased the gradient to over 500 Oe/nm for a head-to-soft magnetic under layer (SUL) spacing of 14 nm. Using the head field distribution, a recording performance analysis by micromagnetic simulation indicated that the write margin was improved. Position and size dispersions of the dots deteriorated the signal-to-noise ratio (SNR) and increased adjacent track erasure (ATE).

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Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 11 )