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Perpendicular patterned media in an (Al0.9Ga0.1)2O3/GaAs substrate for magnetic storage

Wong, Joyce and Scherer, Axel and Barbic, Mladen and Schultz, Sheldon (1999) Perpendicular patterned media in an (Al0.9Ga0.1)2O3/GaAs substrate for magnetic storage. Journal of Vacuum Science and Technology B, 17 (6). pp. 3190-3196. ISSN 1071-1023. http://resolver.caltech.edu/CaltechAUTHORS:WONjvstb99

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Abstract

By using electron beam lithography, chemically assisted ion beam etching, and electroplating, we have fabricated high aspect ratio magnetic columns, 60–170 nm in diameter, embedded in an aluminum–gallium–oxide/gallium–arsenide [(Al0.9Ga0.1)2O3/GaAs] substrate. In our previous work, we demonstrated storage of data in individual columns spaced 2 µm apart. Here the electroplated Ni columns are in the form of tracks (0.5 and 0.25 µm in the down-track direction, and 1 µm in the cross-track direction), corresponding to areal densities of 1.3 and 2.6 Gbits/in.2, respectively. In this report we describe in more detail the issues in the fabrication of patterned media samples, such as dry etching and oxidation of AlGaAs, and electrodeposition of Ni into GaAs substrate. Initial characterization of the resulting magnets using magnetic force microscopy are also presented.


Item Type:Article
Additional Information:©1999 American Vacuum Society. (Received 4 June 1999; accepted 24 August 1999) The authors gratefully acknowledge C. C. Cheng, R. K. Lee, and O. J. Painter for many helpful discussions. This work was funded by the National Science Foundation (MRSEC) Grant No. DMR-94-00439, the Army Research Office, and the Center for Magnetic Recording Research.
Subject Keywords:perpendicular magnetic recording; magnetic particles; nanotechnology; electron beam lithography; electroplating; storage media; magnetic force microscopy; nickel; nanostructured materials; sputter etching; oxidation; gallium arsenide; aluminium compounds
Record Number:CaltechAUTHORS:WONjvstb99
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:WONjvstb99
Alternative URL:http://dx.doi.org/10.1116/1.590978
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1960
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:27 Feb 2006
Last Modified:26 Dec 2012 08:46

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