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Fabrication and Characterization of High Aspect Ratio Perpendicular Patterned Information Storage Media in an Al2O3/GaAs Substrate

Research Area: Nanofabrication Year: 1999
Type of Publication: Article Keywords: patterned media, magnetic media, magnetic force microscopy, nanocolumns, electroplating
Authors: Wong, Joyce; Scherer, Axel; Todorovic, M.; Schultz, S.
Journal: Journal of Applied Physics Volume: 85
Number: 8 Pages: 5489-5491
Month: April
Abstract:
In a new approach, we have fabricated 6:1 aspect ratio magnetic nanocolumns, 60–250 nm in diameter, embedded in a hard aluminum-oxide/gallium-arsenide (Al2O3/GaAs) substrate. The fabrication technique uses the highly selective etching properties of GaAs and AlAs, and highly efficient masking properties of Al2O3 to create small diameter, high aspect ratio holes. Nickel (Ni) is subsequently electroplated into the holes, followed by polishing, which creates a smooth and hard surface appropriate for future reading and writing of the columns as individual bits for high density information storage. We have used magnetic force microscopy and scanning magneto-resistance microscopy to characterize the resulting magnets. We find the columns more magnetically stable than previously achieved with magnets embedded in a SiO2 substrate. Such stability is necessary before further writing of perpendicular patterned media can be demonstrated.
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