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Production and Characterization of Single-Crystal FeCo Nanowires Inside Carbon Nanotubes
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- A. L. Elías
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- J. A. Rodríguez-Manzo
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- M. R. McCartney
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- D. Golberg
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- A. Zamudio
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- S. E. Baltazar
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- F. López-Urías
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- E. Muñoz-Sandoval
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- L. Gu
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- C. C. Tang
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- D. J. Smith
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- Y. Bando
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- H. Terrones
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
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- M. Terrones
- Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Col. Lomas 4 sección, San Luis Potosí, 78216, México, Department of Physics and Astronomy and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1504, Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan, and International Center for Young Scientists (ICYS), National Institute for Materials Science, Namiki 1−1, Tsukuba, Ibaraki 305-0044, Japan
Description
We describe the synthesis of novel monocrystalline FeCo nanowires encapsulated inside multiwalled carbon nanotubes (MWNTs). These FeCo nanowires exhibit homogeneous Fe and Co concentrations and do not contain an external oxide layer due to the presence of insulating nanotube layers. The method involves the aerosol thermolysis of toluene-ferrocene-cobaltocene solutions in inert atmospheres. The materials have been carefully characterized using state-of-the-art high-resolution transmission electron microscopy (HRTEM), electron-energy-loss spectroscopy (EELS), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), electron diffraction, HREELS-STM elemental mapping, X-ray powder diffraction, and SQUID magnetometry. We noted that the formation of FeCo alloys occurs at relatively low pyrolytic temperatures (e.g., 650-750 degrees C). These single-crystal nanowires, which have not been reported hitherto, always exhibit the FeCo (110) plane parallel to the carbon nanotube axis. The FeCo nanomaterials have shown large coercive fields at room temperature (e.g., 900 Oe). We envisage that these aligned ferromagnetic nanowires could be used in the fabrication of high-density magnetic storage devices and magnetic composites.
Journal
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- Nano Letters
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Nano Letters 5 (3), 467-472, 2005-01-28
American Chemical Society (ACS)
