Write/read characteristics of magneto-optical disks

Amorphous films of TbFeCo and NdDyFeCo alloys were prepared on Polycarbonate pregrooved substrates and quartz glass surfaces by an electron beam evaporation. Kerr-rotation, magnetization, coercivity, and Curie temperature were studied on those films. Large Kerr rotation of 0.41 degree and low Curie temperature of 160°C were obtained for the (Nd
33
Dy
67
)
37
(Fe
75
Co
25
)
63
. Studies on write/read characteristics revaled that the compensation composition of TbFeCo was significantly advantage for magneto-optical data storage. It was found that the NdDyFeCo was useful for the high data transfer rate recording on the magneto-optical memory.