PERPENDICULAR MAGNETIC RECORDING HARD-DISK MEDIA USING FERRITE SUBSTRATE

To serve the needs of high linear bit density recording and high data transfer rate, a new perpendicular recording hard disk media constitut ion is proposed. In the new hard disk media, a Co-Cr layer is directly deposited on a soft-magnetic Mn-Zn single-crystal ferrite substrate. The ferrite substrate hard disk showed superior high-frequency respons e to a conventional Co-Cr/ Fe-Ni-Nb double-layered hard disk with glas s substrate. This improvement in high frequencies is brought about by suppressing the eddy current losses because of high electric resistivi ty of the ferrite substrate.