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Magnetic thin films of cobalt nanocrystals encapsulated in graphite-like carbon

Nature volume 381, pages 772–774 (1996)Cite this article

Abstract

A VARIETY of crystalline materials have now been encapsulated in nanometre-scale graphitic cages1–8 and tubules9–11. For magnetic materials, encapsulation should serve the dual role of protecting air-sensitive particles against degradation and reducing the magnetic coupling between individual particles, thus potentially opening the way for applications of these composite materials as ultra-high-density magnetic recording media12,13. But to realize this potential, the materials must be available in the form of thin, smooth films, with precise control of the size of the individual magnetic crystallites. Here we report the fabrication and characterization of magnetic thin films, consisting of cobalt nanocrystals encapsulated in graphite-like carbon cages, that meet these structural requirements.

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References

  1. Ruoff, R. S., Lorents, D. C., Chan, B., Malhotra, R. & Subramoney, S. Science 259, 346–348 (1993).

    Article  ADS  CAS  Google Scholar 

  2. Tomita, M., Saito, Y. & Hayashi, T. Jap. J. appl. Phys. 32, L280–L282 (1993).

    Article  ADS  CAS  Google Scholar 

  3. Ajayan, P. M. & lijima, S. Nature 361, 333–334 (1993).

    Article  ADS  CAS  Google Scholar 

  4. Saito, Y. et al. J. appl. Phys. 75, 134–137 (1994).

    Article  ADS  CAS  Google Scholar 

  5. Saito, Y. et al. Jap. J. appl. Phys. 33, L526–L529 (1994).

    Article  ADS  CAS  Google Scholar 

  6. Saito, Y. et al. J. Phys. Chem. Solids 54, 1849–1860 (1993).

    Article  ADS  CAS  Google Scholar 

  7. Yoshida, Y., Shida, S., Ohsuna, T. & Shiraga, N. J. appl. Phys. 76, 4533–4539 (1994).

    Article  ADS  Google Scholar 

  8. McHenry, M. E., Majetich, S. A., Artman, J. O., DeGraef, M. & Staley, S. W. Phys. Rev. B49, 11358–11363 (1994).

    Article  CAS  Google Scholar 

  9. McHenry, M. E., Brunsma, E. M. & Majetich, S. A. IEEE Trans. Mag. 31, 3787–3789 (1995).

    Article  ADS  CAS  Google Scholar 

  10. Guerret-Piécourt, C., Le Bouar, Y., Loiseau, A. & Pascard, H. Nature 372, 761–765 (1994).

    Article  ADS  Google Scholar 

  11. Tsang, S. C., Chen, Y. K., Harris, P. J. F. & Green, M. L. H. Nature 372, 159–162 (1994).

    Article  ADS  CAS  Google Scholar 

  12. Murdock, E. S., Simmons, R. F. & Davison, R. IEEE Trans. Mag. 28, 3078–3083 (1992).

    Article  ADS  CAS  Google Scholar 

  13. Yogi, T. & Nguyen, T. A. IEEE Trans. Mag. 29, 307–316 (1993).

    Article  ADS  CAS  Google Scholar 

  14. Kaufman, H. R. J. Vac. Sci. Technol. 15, 272–276 (1978).

    Article  ADS  CAS  Google Scholar 

  15. Murayama, A., Kondoh, S. & Miyamura, M. in Proc. 3rd Int. Symp. Phys. Mag. Mater. (eds Kirn, C. S., Lee, T. D. & Oh, J. H.) 478–482 (Hamlim, Seoul, Korea, 1995).

    Google Scholar 

  16. Nagakura, S. J. phys. Soc. Japan 16, 1213–1219 (1961).

    Article  ADS  CAS  Google Scholar 

  17. Liu, B. X., Wang, J., Sheng, X. Y. & Fang, Z. Z. Phys. Status Solidi A128, K71–K75 (1991).

    Article  ADS  CAS  Google Scholar 

  18. Konno, T. J. & Sinclair, R. Acta metell. mater. 42, 1231–1247 (1994).

    Article  CAS  Google Scholar 

  19. Tajima, S. & Hirano, S. J. Mater. Sci. Lett. 11, 22–25 (1992).

    Article  CAS  Google Scholar 

  20. Kazama, N., Heiman, N. & White, R. L. J. appl. Phys. 49, 1706–1708 (1978).

    Article  ADS  CAS  Google Scholar 

  21. Kobayashi, T., Nakatani, R., Ootomo, S., Kumasaka, N. & Shiiki, K. J. appl. Phys. 64, 3157–3162 (1988).

    Article  ADS  CAS  Google Scholar 

  22. Yogi, T., Nguyen, T. A., Lambert, S. E., Gorman, G. L. & Castillo, G. IEEE Trans. Mag. 26, 1578–1580 (1990).

    Article  ADS  CAS  Google Scholar 

  23. Hamilton, H. J. mag. Soc. Japan 18, (suppl.) 171–178 (1994).

    Google Scholar 

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Authors and Affiliations

  1. NTT Interdisciplinary Research Laboratories, 3-9-11, Midori-cho, Musashino-shi, Tokyo, 180, Japan

    Takayoshi Hayashi, Shigeru Hirono, Masato Tomita & Shigeru Umemura

Authors
  1. Takayoshi Hayashi
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  2. Shigeru Hirono
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  3. Masato Tomita
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  4. Shigeru Umemura
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Hayashi, T., Hirono, S., Tomita, M. et al. Magnetic thin films of cobalt nanocrystals encapsulated in graphite-like carbon. Nature 381, 772–774 (1996). https://doi.org/10.1038/381772a0

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