Regular Array of Magnetic Nano-Dots Prepared by Nanochannel Glass Replica Masks
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Regular Array of Magnetic Nano-Dots Prepared by Nanochannel Glass Replica Masks Bo Cheng, Kun Yang, B. L. Justus1, and W. J. Yeh Department of Physics, University of Idaho, Moscow, ID 83844-0903, U.S.A. 1 Optical Sciences Division, Naval Research Laboratory, Washington, D. C. 20375-5338, U.S.A. ABSTRACT In magnetic recording technology, barriers based on fundamental physical limits on the data density are being approached for the current longitudinal recording modes. However, demands for higher data storage density have escalated in recent years. Discrete perpendicular recording is a viable method to achieve 100 Gb per square inch and beyond. We report on the development of a novel technique to fabricate uniform arrays of nano-sized magnetic dots. Uniform arrays of nanometer-sized magnetic dots are obtained by magnetron sputtering deposition through a nanochannel glass replica mask. The platinum replica masks are fabricated using thin film deposition on etched nanochannel glass and contain uniform hexagonally patterned voids with diameters as small as 50 nanometers. The magnetic dot density can be as high as 1011 per square inch. Our method provides a simple yet effective way to create regularly arranged discrete magnetic media that can be used for perpendicular magnetic recording. The magnetic properties of the dots are studied with a vibrating sample magnetometer.
INTRODUCTION Due to thermal instabilities and crosstalk noise, longitudinal recording is not expected to be able to achieve a 60 Gb/in2 recording density (1). Patterned media in which each bit is stored in a single-domain magnetic island have been proposed as a means to achieve bit densities up to 100 Gb/in2 and beyond. There have also two modes for patterned media: longitudinal and perpendicular. Since in principle the perpendicular recording mode can have higher recording density in comparison with the longitudinal mode, most research work is concentrated on how to create magnetic media with regular arrays of nano-size dots for perpendicular recording. Traditionally, patterning of nano-size features is obtained by e-beam lithography (2) and ion beam writing. However, both of the techniques are not cost-effective for creating large area patterns. Recently, nanoimprint (3) and achromatic interferometric lithography (4) have been developed as cost-effective ways to make regular arrays of magnetic dots in the nanometer regime. In this paper, we report a novel method to fabricate extremely uniform arrays of nano-sized magnetic dots with density as high as 1011/in2. The order and size of the magnetic dots are obtained by fabrication methods using metallic mask membranes. These membranes, fabricated using nanochannel glass (5) technology, have been described previously and are known as replica masks (6).
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