Recording performance of longitudinal barium ferrite thin film media

The high density recording characteristics of barium ferrite thin film media have been investigated. High levels of overwrite are achieved. Media microstructures have been identified to have a close relation to the noise behavior in the barium ferrite thin films. A linear increase in noise spectra is observed, indicating the existence of transition noise. In addition, positive ΔM peaks are seen in all longitudinal barium ferrite samples. Magnetostatic interactions rather than exchange interactions among neighboring grains are believed to be the cause of the positive ΔM. To reduce media noise, a reduction in both grain size and grain aspect ratio is necessary