Magnetic properties of nanometer-size CoPt particles

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  • S. H. Liou
    Behlen Laboratory of Physics and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0111
  • Y. Liu
    Department of Mechanical Engineering and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0656
  • S. S. Malhotra
    Behlen Laboratory of Physics and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0111
  • M. Yu
    Behlen Laboratory of Physics and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0111
  • D. J. Sellmyer
    Behlen Laboratory of Physics and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0111

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<jats:p>We have prepared nanometer-size, isolated CoPt particles. The particles in the range of 100–300 nm in diameter were formed by annealing thin films in the temperature range of 550–800 °C. Films with magnetic coercivity as high as 30 kOe were achieved. The results indicate that the high magnetic coercivity was obtained because the crystallite size approaches that of noninteracting single-domain particles.</jats:p>

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