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Close-packed noncircular nanodevice pattern generation by self-limiting ion-mill process
Authors:Parekh Vishal A  Ruiz Ariel  Ruchhoeft Paul  Brankovic Stanko  Litvinov Dmitri
Affiliation:Electrical and Computer Engineering, University of Houston, Houston, Texas 77204, USA.
Abstract:We describe a self-limiting, low-energy argon-ion-milling process that enables noncircular device patterns, such as squares or hexagons, to be formed using precursor arrays of uniform circular openings in poly(methyl methacrylate) defined using electron beam lithography. The proposed patterning technique is of particular interest for bit-patterned magnetic recording medium fabrication, where square magnetic bits result in improved recording system performance. Bit-patterned magnetic medium is among the primary candidates for the next generation magnetic recording technologies and is expected to extend the areal bit density limits far beyond 1 Tbit/in(2). The proposed patterning technology can be applied either for direct medium prototyping or for manufacturing of nanoimprint lithography templates or ion beam lithography stencil masks that can be utilized in mass production.
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