Enhanced magnetic coercivities in Fe nanowires

N. Grobert, W. K. Hsu, Y. Q. Zhu, J. P. Hare, H. W. Kroto, D. R.M. Walton, M. Terrones, H. Terrones, Ph Redlich, M. Rühle, R. Escudero, F. Morales

Research output: Contribution to journalArticlepeer-review

300 Scopus citations

Abstract

We describe a way of generating films (<2mm2; < 40 μm thick) of aligned Fe-filled carbon nanotubes. These Fe nanowires are usually composed of single Fe crystals, and have dimensions from 5-40 nm outer diameter and < 10 μm in length. The carbon tubes, which coat the wires, have external diameters of ∼ 20-70 nm and are <40 μm in length. High-resolution electron energy loss spectroscopy, x-ray powder diffraction, and elemental mapping of the tubular structures reveal only characteristic metallic signals and the effective absence of oxygen (or any other nonmetallic element) within the wires. The material exhibits coercivities in the 430-1070 Oe range, i.e., greater than those reported for Ni and Co nanowires.

Original languageEnglish (US)
Pages (from-to)3363-3365
Number of pages3
JournalApplied Physics Letters
Volume75
Issue number21
DOIs
StatePublished - Nov 22 1999

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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