SOFT MAGNETIC FILM FOR PERPENDICULAR RECORDING DISK

摘要

A PERPENDICULAR MAGNETIC RECODING DISK (300) HAVING A SOFT MAGNETIC FILM (315) DISPOSED BETWEEN A SUBSTRATE (310) AND A MAGNETIC RECORDING LAYER (350). THE SOFT MAGNETIC FILM (315) INCLUDES A SOFT MAGNETIC UNDERLAYER (320) AND ONE OR MORE LAYER GROUPS HAVING A SPACER LAYER (321) AND A SOFT MAGNETIC LAYER (331) DISPOSED ABOVE THE SPACER LAYER (321) IN EACH LAYER GROUP. THE SPACER LAYERS (321) INDUCE ANTI-FERROMAGNETIC COUPLING BETWEEN THE SURROUNDING FERROMAGNETIC LAYERS. THE SPACER LAYERS (321) MAY BE COMPRISED OF RUTHENIUM. THE SOFT MAGNETIC LAYERS (320, 321) MAY HAVE A GRANULAR DECOUPLED STRUCTURED THROUGH THE USE OF A SEGREGATE.(FIG 3B)