Micromagnetic analysis of anisotropy orientation in high density longitudinal magnetic recording

Micromagnetic simulations have been performed to compare the recording perf ormance of oriented media (M-r = 1.50) with planar isotropic media in longi tudinal recording. With no exchange, oriented medium exhibits substantially less dc noise power thus larger signal-to-noise ratio (SNR). But with incr easing linear density, the oriented medium shows larger nonlinear amplitude reduction, larger nonlinear transition shift, and less SNR advantage. At f inite exchange, there is no substantial SNR difference between oriented and isotropic medium. (C) 2000 American Institute of Physics. [S0021-8979(00)8 3308-3].