Magnetic properties of graphitically encapsulated nickel nanocrystals

Journal of Materials Research volume 12, pages1076–1082(1997)Cite this article

Abstract

Graphitically encapsulated ferromagnetic Ni nanocrystals have been synthesized via a modified tungsten arc-discharge method. By virtue of the protective graphitic coating, these nanocrystals are stable against environmental degradation, including extended exposure to strong acids. The magnetic properties of the encapsulated particles are characterized with regard to the nanoscale nature of the particles and the influence of the graphitic coating which is believed to be benign insofar as the intrinsic magnetic properties of the encapsulated nanocrystals are concerned. The Curie temperature of graphitically encapsulated Ni nanocrystals is the same as that of microcrystalline Ni. However, saturation magnetization, remanent magnetization, and coercivity of these particles are reduced, for a range of temperatures. The unique features are compared with those of unencapsulated nanocrystalline and coarse microcrystalline nickel particles.

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Affiliations

  1. Department of Materials Science and Engineering, Materials Research Center, Northwestern University, 60208, Evanston, Illinois, USA

    J. H. Hwang, V. P. Dravid, J. J. Host, B. R. Elliott, D. L. Johnson & T. O. Mason

  2. Department of Geology, National Taiwan University, Taipei, Taiwan, Republic of China

    M. H. Teng

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  1. J. H. Hwang
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  2. V. P. Dravid
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  3. M. H. Teng
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  4. J. J. Host
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  5. B. R. Elliott
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  6. D. L. Johnson
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  7. T. O. Mason
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Correspondence to J. H. Hwang.

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Hwang, J.H., Dravid, V.P., Teng, M.H. et al. Magnetic properties of graphitically encapsulated nickel nanocrystals. Journal of Materials Research 12, 1076–1082 (1997). https://doi.org/10.1557/JMR.1997.0150

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