Optimum writing field for high-frequency magnetic recording

Realistic recording conditions in longitudinal thin-film media at high-frequency (up to 1 GHz) are investigated by a micromagnetic simulation. It is found that the recording frequency should be set below the characteristic frequency (1/2 Tr, where Tr is the rise time of the writing head); optimum writing field intensity must be increased by 1.2 Oe per MHz at a linear density of 244 kFCI; and remanence coercivity measured by a square pulse slightly increases up to 1 GHz when damping constant is 0.03