By optimization of the synthesis of ferromagnetic-filled carbon nanotube ensembles on Si substrates (catalytic decomposition of ferrocene) and following annealing at , marked hysteresis loops can be measured by the alternating-gradient method. Unusually high coercivities and strong anisotropies with an easy magnetic axis parallel to the alignment of the nanotubes are observed from the as-grown samples, whereas an enhanced magnetic saturation moment (up to a factor of 2) and a decreased anisotropy are realized after annealing at . The increase of the magnetic saturation moment of the Fe-filled carbon nanotube ensembles is caused by the entire transformation within the tubes of the and phases to ferromagnetic and graphite. X-ray diffraction with different glancing incidence shows that the is predominantly at the tips of the nanotubes, while the iron carbide resides closer to the substrate. However, after the annealing process only is found. At an annealing temperature of the nanotube structures are destroyed and the magnetic characteristics are dramatically altered (viz., the disappearance of anisotropy and reduction in coercivity).
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1 October 2005
Research Article|
October 14 2005
Enhanced magnetism in Fe-filled carbon nanotubes produced by pyrolysis of ferrocene
A. Leonhardt;
A. Leonhardt
a)
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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M. Ritschel;
M. Ritschel
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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D. Elefant;
D. Elefant
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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N. Mattern;
N. Mattern
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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K. Biedermann;
K. Biedermann
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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S. Hampel;
S. Hampel
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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Ch. Müller;
Ch. Müller
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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T. Gemming;
T. Gemming
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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B. Büchner
B. Büchner
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germany
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A. Leonhardt
a)
M. Ritschel
D. Elefant
N. Mattern
K. Biedermann
S. Hampel
Ch. Müller
T. Gemming
B. Büchner
Leibniz-Institute of Solid State and Materials Research Dresden
, P.O. Box 27 00 16, D-01171 Dresden, Germanya)
Electronic mail: [email protected]
J. Appl. Phys. 98, 074315 (2005)
Article history
Received:
April 18 2005
Accepted:
August 10 2005
Citation
A. Leonhardt, M. Ritschel, D. Elefant, N. Mattern, K. Biedermann, S. Hampel, Ch. Müller, T. Gemming, B. Büchner; Enhanced magnetism in Fe-filled carbon nanotubes produced by pyrolysis of ferrocene. J. Appl. Phys. 1 October 2005; 98 (7): 074315. https://doi.org/10.1063/1.2058181
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