ADVANCED MULTILAYER THIN-FILMS FOR ULTRA-HIGH DENSITY MAGNETIC RECORDING MEDIA

The magnetic and structural properties of three high-coercivity, low m oment multilayers for ultra-high density magnetic recording media were examined. The CoCrPt/Cr/CoCrPt multilayer exhibited extremely small g rain size (similar to 80 Angstrom) and high in-plane coercivity of 370 0 Oe. The Cr interlayer caused decoupling of the magnetic layers which led to low S and low medium noise. The CoCrPt/CoCrPt/CoCrPt multilay er with different amount of intergranular coupling within sublayers ex hibited high coercivity similar to 2700 Oe and S=0.90. CoCrPt/CoCrTa multilayer exhibited improved inplane anisotropy due to larger amount of in-plane oriented c-axes. This led to high coercivity similar to 37 00 Oe and S=0.88. Also fine grain diameters were observed in this fil m. Results obtained suggest that it is possible to produce CoCrPt-base d multilayers with properties and structure required for 10 Gbit/inch( 2) longitudinal thin film magnetic recording media,