Low noise perpendicular magnetic recording media for deep submicron track width recording

Noise reduction in double-layered perpendicular recording media with a thic k soft magnetic backlayer was studied. Although the medium noise was increa sed with the backlayer, the noise for quaternary alloy films could be subst antially reduced by introducing a certain intermediate layer between the al loy layer and the backlayer. The double-layered medium obtained exhibited a waveform with sharp transitions as well as a low noise property when recor ded with a single pole head. The recording performances suggested the poten tial of the medium for a high areal density recording around 50 Gbit/in(2).