Metal particulate (MP)/metal evaporation (ME) double-layered media for high-density recording

We have fabricated a double-layered tape composed of a metal thin film unde rlayer and a metal particulate (MP) upper layer. Two kinds of metal thin fi lms-Cu nonmagnetic and Co magnetic-were deposited under the MP layer by met al evaporation (ME). We found that the magnetic underlayer affected the mag netic recording properties of the tape in high-density recording. Co magnet ic underlayer tape output was significantly enhanced compared to Cu nonmagn etic underlayer tape output, especially at shorter recording wavelengths. I t is possible to enhance output by introducing another high-density recordi ng layer under thr main magnetic layer. We consider that the internal magne tization of the magnetic underlayer assists the upper layer recording under this condition, providing a new way to improve the recording density of MP media.