Micromagnetic specifications for recording self-assembled bit-patterned media

A design including exchange coupled composite (ECC) bits in hexagonal arrays and a multi-pole write head is proposed to meet the requirement of 9.7 × 10−4 bit error rate, 4 nm magnetic fly height, 5% switching field distribution, 5% synchronization error, and 5% jitter error to achieve 2.9 Tbits/in.2 bit-patterned recording. Our head design writes two staggered tracks in a single pass and has maximum perpendicular field gradients of 580 Oe/nm along the down-track direction and 476 Oe/nm along the cross-track direction.