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Magnetic Properties of Graphitically Encapsulated Nickel Nanocrystals

Published online by Cambridge University Press:  31 January 2011

J.-H. Hwang ,
V. P. Dravid ,
M. H. Teng ,
J. J. Host ,
B. R. Elliott ,
D. L. Johnson  and
T. O. Mason
J.-H. Hwang
Affiliation:
Department of Materials Science and Engineering, Materials Research Center, Northwestern University, Evanston, Illinois 60208
V. P. Dravid
Affiliation:
Department of Materials Science and Engineering, Materials Research Center, Northwestern University, Evanston, Illinois 60208
M. H. Teng
Affiliation:
Department of Geology, National Taiwan University, Taipei, Taiwan, Republic of China
J. J. Host
Affiliation:
Department of Materials Science and Engineering, Materials Research Center, Northwestern University, Evanston, Illinois 60208
B. R. Elliott
Affiliation:
Department of Materials Science and Engineering, Materials Research Center, Northwestern University, Evanston, Illinois 60208
D. L. Johnson
Affiliation:
Department of Materials Science and Engineering, Materials Research Center, Northwestern University, Evanston, Illinois 60208
T. O. Mason
Affiliation:
Department of Materials Science and Engineering, Materials Research Center, Northwestern University, Evanston, Illinois 60208
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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.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 4 , April 1997 , pp. 1076 - 1082
Copyright
Copyright © Materials Research Society 1997

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