Effect of orientation ratio on recording performance for longitudinal thinfilm media

The effects of orientation ratio (OR) on longitudinal thin film media recor ding performance are studied via micromagnetic modeling. The OR of the medi a is controlled by the anisotropy axes distribution, Along the preferred an isotropy direction, the coercivity and the remanence increases with decreas ing standard deviation of anisotropy distribution sigma and gives rise to a n OR as high as 90, Highly oriented media show an ultra low transition nois e and high effective track width, However, it is observed that highly orien ted media exhibits a large track edge bending which increases the track edg e noise. Effect of saturation magnetization (M-s) on the recording pattern for highly oriented media (OR = 22.5) is investigated. Low magnetization is found to induce even lower transition noise and slightly higher effective track width, Edge percolation is observed when M-s increases up to 800 emu/ cm(3). However, the noise magnitude at this edge does not change much when M-s is decreased to 200 emu/cm(3).