MAGNETOSTATIC COUPLING MSR WITH INPLANE PI MAGNETIZATION FILMS/

Magnetically induced super resolution (MSR) with double (front and rea r) masks was achieved using GdFeCo/GdFe/TbFeCo (readout/intermediate/m emory) triple layer films. The duplication of information from the mem ory layer to the readout layer is done through the magnetostatic coupl ing. The front mask and the rear mask are formed by in-plane magnetiza tion and by collapsing written domains, respectively, without applying external fields. The transition from in-plane to perpendicular magnet ization was made sharper by introducing the intermediate layer. Using this MSR medium and a conventional optical head (lambda = 780 nm), car rier-to-noise ratio (C/N) of over 45 dB for a mark length of 0.40 mu m and crosstalk of -38 dB for a 0.8 mu m track pitch were achieved. How ever, during the readout process, the magnetostatically coupled MSR me dium is much more sensitive to the disturbance of external fields than exchange-coupled MSR medium.