Abstract
The characteristics of bit patterned media with an areal density of 2 Tbit/in^2 were investigated using micromagnetic simulations. The influence of dot size and position dispersions on the signal to noise ratio (SNR) was clarified. The head medium synchronization tolerance (Write margin) for error-free writing was calculated, and the feasibility of achieving 2 Tbit/in^2 recording with bit patterned media was demonstrated. In a medium with size/position dispersions, SNR decreased. Errors occurred when the magnetization of the target and next dots were opposed. Write margin depends on the head field gradient and a higher head field gradient improves recording performance. The write margin for a medium with M_s of 860 emu/cm^3 and dispersions (σK_u=10%, σθ=3°, σP=1nm, σS=15%) was a maximum of 8 nm when using a head field gradient of 511 Oe/nm.
