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1711small magnetic domains

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  • David Forrest
    Mar 1, 2001
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      APPLIED PHYSICS: Stabilizing Miniaturized Memories
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      Ian S. Osborne

      Increasing the bit density of magnetic devices by decreasing the size of
      the bit that is magnetically written on has yielded storage media operating
      at a density of about 1 gigabit per square centimeter. At higher densities
      and smaller bit sizes, however, the stored information on each bit, in the
      form of a magnetic orientation, becomes susceptible to thermally induced
      fluctuations and spontaneous reversals of the magnetization.

      Lohau et al. report results from one possible solution in which the memory
      elements are patterned. Using an ion-beam, they divide a magnetic thin film
      of granular cobalt-chromium-platinum into an array of isolated square
      islands, with dimensions between 80 and 230 nm, corresponding to areal
      densities of 16 Gbit/cm2 and 1.6 Gbit/cm2, respectively. They find that
      bits with dimensions less than 130 nm comprise a single magnetic domain,
      can be individually addressed, and are relatively stable to thermal memory
      loss as compared to similar areas written to in the unpatterned region of
      the material. -- ISO

      Appl. Phys. Lett. 78, 990 (2001).