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

Metal Evaporated Media

“…Consequently, a CoO underlayer was not used for the 23 Gb/in. 2 oblique metal evaporated media (Motohashi et al, 2007).…”

“…Since then, the density capability of metal evaporated media has continuously improved and the most recent demonstration in 2007 presented an obliquely evaporated medium capable of supporting 23 Gb/in. 2 (Motohashi et al, 2007). Table 2.1 lists a selection of the areal density demonstrations reported over the last 15 years.…”

“…GMR technology provides additional sensitivity compared to AMR technology. The availability of GMR sensors, thus gave the opportunity to demonstrate even higher recording densities (Kagawa et al, 1997;Motohashi et al, 2007;Ozue et al, 2002;Suzuki et al, 2004;Tetsukawa et al, 2002). Areal density of 4, 11.5, and 23 Gb/in.…”

“…Areal density of 4, 11.5, and 23 Gb/in. 2 were achieved using GMR sensors and optimized Co-CoO metal evaporated media between the years 2002 and 2007 (Motohashi et al, 2007;Ozue et al, 2002;Tetsukawa et al, 2002). These demonstrations exploited fully the possibility to tune the medium magnetic properties with the evaporation conditions and therefore to adjust the medium Mr.t product to the sensitivity of the available GMR readers.…”

“…2 , further evaporation adjustments were performed. To improve the degree of orientation of the medium, the range of incident deposition angles was reduced by 5 compared to previous demonstrations: Y min was set to 45 (Motohashi et al, 2007) compared to the precedent value of 50 . The oxidation process was again controlled to obtain maximum coercivity.…”