Computer simulation of magnetization switching behavior in high-data-rate hard-disk media

We have investigated magnetization switching behavior in high-data-rate hard-disk media by micro-magnetic simulation. We found that the remanence coercivity measured by a short-pulse-field depended on the field-pulse shape. The time integration of external field over the remanent coercivity for a long-pulse-field, namely switching force integration (SFI), was an essential factor for the switching, We also found that the optimum writing held, H-omega must be increased by only 0.4 kA/m per MB/s independent of the linear recording density. Overwrite (OU') value decreased by 1 dB per percentage point of H-omega and did not depend on the data-transfer rate, The recording characteristics at high data-transfer rates were not degraded if only a writing field of H-omega was applied to the him, The simulation results were consistent with the results of read/write experiments especially OW characteristics up to 80 MB/s.