DOUBLE COMPENSATION POINT MEDIA FOR DIRECT OVERWRITE

Two magneto-optic media configurations are discussed that are suitable for direct overwrite by light intensity modulation using only one con ventional bias magnet. One configuration consists of two magnetic laye rs (memory and reference having perpendicular anisotropy) exchange cou pled through an intermediate soft magnetic layer. The second media con figuration consists of only a memory layer and an intermediate layer. This scheme produced a respectable direct overwrite performance of 48 dB using a 3.5 mum mark size, 30 kHz bandwidth, and 7 m/s disk velocit y. The major advantages of this scheme are simpler disk structures rel ative to a previously proposed quadrilayer scheme, and a wide range fo r Curie temperatures, thicknesses, and coercivities of the individual layers.