CONTROL OF THE EXCHANGE-COUPLING FORCE IN MAGNETIC SUPER RESOLUTION MAGNETOOPTICAL RECORDING MEDIA WITH INPLANE MAGNETIZATION LAYERS

The exchange-coupling force between GdFeCo readout layers and TbFeCo m emory layers has been investigated for magnetically induced super reso lution (MSR) magnetooptical recording media with in-plane magnetizatio n layers. The exchange-coupling force can be suppressed in the mask ar ea while mediated in the aperture area by introducing GdFe intermediat e layers with large negative perpendicular magnetic anisotropy at room temperature and with relatively low Curie temperatures. As a result, the masking effect is substantially improved, and the recorded informa tion of the memory layer can be copied more completely onto the readou t layer at readout temperatures, resulting in a higher performance of MSR media.