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MA: Magnetismus
MA 26: Mikro- und nanostrukturierte Materialien
MA 26.5: Vortrag
Donnerstag, 11. März 2004, 16:15–16:30, H10
Magnetic recording on nanostructures — •Manfred Albrecht1, Charles T. Rettner2, Andreas Moser3, Margaret E. Best3, and Bruce D. Terris3 — 1University of Konstanz, Dept. of Physics, P.O.Box M631, D-78547 Konstanz, Germany — 2IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA — 3Hitachi San Jose Research Center, 650 Harry Road, San Jose, CA 95120, USA
The creation of lithographic magnetic nanostructures for single-bit data storage is recognized as a promising approach to overcoming the areal density limit for magnetic recording imposed by superparamagnetism [1].
Isolated tracks of magnetic single-domain nanostructures with lateral sizes of up to 30 nm have been fabricated by patterning perpendicular Co70Cr18Pt12 continuous films using focused ion beam lithography. We demonstrate writing and reading of individual nanostructures using a scanning magnetoresistive microscope. We present results on transition position jitter and signal-to-noise ratio (SNR) for nanostructure arrays and compare them with those on equivalent unpatterned strips of the media. We observe that patterning dramatically reduces jitter and improves SNR, which is independent of track width [2]. Moreover, the synchronization requirements needed for writing bits in patterned media was investigated and a novel type of magnetic pattern for servo control was introduced [3].
[1] D. Weller and A. Moser, IEEE Trans. Magn. 35, 4423 (1999).
[2] M. Albrecht et al., Appl. Phys. Lett. 81, 2875 (2002).
[3] M. Albrecht et al., Appl. Phys. Lett. 83, (2003) in press.