Shingled magnetic recording on bit patterned media at 10 Tb/in²

In this work, we have combined shingled magnetic recording and bit patterned media (BPM) to achieve an areal density of 10 Tb/in². In our design, the gradient of the write field along the cross track direction is as high as 700 Oe/nm. Composite BPM are utilized and the ratio of thermal stability to switching field is optimized accordingly. Assuming 5% switching field distribution, 5% timing error, 5% jitter error and 5% track misregistration, the write field is 7.8 kOe and the BER is 8.0× 10 ^-4 for 10 Tb/in² with 5.4 nm × 5.4 nm dots; the write field is 7.9 kOe and the BER is 1.0× 10^-3 for 9.6 Tb/in² with 4.4 nm × 4.4 nm dots.