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Magnetic graphene-ribbon is a candidate for realizing future ultra highdensity 100 tera bit/inch2 class data storage media. Multiple spin stateanalysis was done based on the density function theory. A typical model was asuper cell [C80H7] which having bare (radical) carbons on one side zigzag edge,whereas mono hydrogenated on another side. Optimizing atomic configuration,self consistent calculation demonstrated that a total energy of the highestspin state is more stable than that of lower one, which came from exchangecoupling between carbons. This analysis suggested a capability of designingmagnetic data track utilizing such chemically edge modified graphene ribbon. Inorder to increase areal magnetization density, bilayer and quadri-layergraphene-ribbon model were analyzed. Detailed calculation resulted that alsothe highest spin state is the most stable one. Multiplying the layer numbers iseffective way to realize and enhance strong magnetism.

Design of Magnetic Graphene-ribbon for 100 Tera-bit/inch2 Information Storage Media