Investigation of Higher Recording Density Using an Improved Co–CoO Metal Evaporated Tape With a GMR Reproducing Head

To demonstrate the highest areal recording density of tape media, we have developed a metal evaporated tape with higher magnetic anisotropy of 2.5times10
⁵
J/m
³
and finer magnetic activation volume of 2.7times10
^-24
m
³
of a Co-CoO recording layer deposited on a smoother base film. A capability of an areal recording density of 23.0 Gb/in
²
was confirmed using a giant magnetoresistive head as a read head. The smoother surface roughness improved signal-to-noise ratio more than 2 dB