Co-γFe
2O
3 longitudinal magnetic recording media obtained by annealing CoO-Fe
3O
4 were prepared on NiO underlayer. The coercivity
Hc was varied with the Co content, namely, the atomic ratio of Co/Fe in Co-γFe
2O
3, and the oxygen partial pressure in deposition of CoO-Fe
3O
4. The
Hc of the media with Co/Fe = 4 at% was 2000-3500 Oe, 1.3-3.6 times higher than that of Co-γFe
2O
3 media without NiO underlayer. The grain size of Co-γFe
2O
3 became smaller with decreasing the thickness. The read/write characteristics of the media with no overcoat were evaluated in contact recording. Co-γFe
2O
3 media on NiO had higher
D50 and lower medium noise than those of the media without NiO underlayer.
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