Magnetically Superior and Easy to Handle L10-FePt Nanocrystals

Shinpei Yamamoto; Yasumasa Morimoto; Teruo Ono; Mikio Takano

doi:10.1063/1.1995959

Magnetically Superior and Easy to Handle L10-FePt Nanocrystals

Materials Science 2009-11-11 v1

Authors: Shinpei Yamamoto , Yasumasa Morimoto , Teruo Ono , Mikio Takano

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Abstract

We report a successful synthesis of monodisperse L10-FePt nanocrystals which are not only superior in magnetism but also easy to handle through being dispersible in solvents. Thanks to a thick SiO2-coating, the thermal treatment needed to form the L10 structure can be done even at 900 oC without inducing coalescence and coarsening. The protecting shell was thereafter removed in a specific way that enabled us to recover the L10-FePt nanocrystals in a water-dispersion. The SiO2-coated nanocrystals show a high coercivity of 18.5 kOe at room temperature in spite of their core size of only 6.5 nm in diameter, and the hysteresis loop of the water-dispersed nanocrystals, which were frozen under an external field, was almost rectangular indicating that their magnetic and structural orientation could be attained.

Keywords

L10-FePt nanocrystals magnetic properties SiO2 coating water dispersion coercivity

Cite

@article{arxiv.cond-mat/0505006,
  title  = {Magnetically Superior and Easy to Handle L10-FePt Nanocrystals},
  author = {Shinpei Yamamoto and Yasumasa Morimoto and Teruo Ono and Mikio Takano},
  journal= {arXiv preprint arXiv:cond-mat/0505006},
  year   = {2009}
}

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14 pages, 5 figures

Magnetically Superior and Easy to Handle L10-FePt Nanocrystals

Abstract

Keywords

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