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Published April 26, 1999 | Published
Journal Article Open

Writing and reading of single magnetic domain per bit perpendicular patterned media


By fabricating patterned media with a large number of nanoscale single domain magnetic particles embedded in a nonmagnetic substrate, and by writing the magnetization for each of these particles in a desired direction, nonvolatile magnetic storage of information could reach densities much higher than what is currently thought possible for longitudinal continuous media. We have fabricated high aspect ratio perpendicular nickel columnar nanoparticles embedded in a hard Al2O3/GaAs substrate. We show that the magnetization states of the individual magnets can be controlled by demonstrating that prototype patterned "single magnetic domain per bit" data tracks can be written and read back using current magnetic information storage technology.

Additional Information

© 1999 American Institute of Physics. Received 15 January 1999; accepted 26 February 1999. The authors would like to thank George Kassabian, Sam Hobbs, and Mark Vojkovich for technical help, J. Smyth and M. Re for providing them with the MR heads, Chuan-Cheng Cheng for helpful discussions, and Reginald Lee for the growth of the MBE samples. This work was supported by the Center for Magnetic Recording Research, ARO, and NSF (MRSEC) Grant No. DMR-94-00439.

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