Room-temperature ferromagnetic nanotubes controlled by electron or hole doping

L. Krusin-Elbaum (), D. M. Newns, H. Zeng, V. Derycke, J. Z. Sun and R. Sandstrom
Additional contact information
L. Krusin-Elbaum: T. J. Watson Research Center
D. M. Newns: T. J. Watson Research Center
H. Zeng: T. J. Watson Research Center
V. Derycke: T. J. Watson Research Center
J. Z. Sun: T. J. Watson Research Center
R. Sandstrom: T. J. Watson Research Center

Nature, 2004, vol. 431, issue 7009, 672-676

Abstract: Abstract Nanotubes and nanowires with both elemental1,2 (carbon or silicon) and multi-element3,4,5 compositions (such as compound semiconductors or oxides), and exhibiting electronic properties ranging from metallic to semiconducting, are being extensively investigated for use in device structures designed to control electron charge6,7,8. However, another important degree of freedom—electron spin, the control of which underlies the operation of ‘spintronic’ devices9—has been much less explored. This is probably due to the relative paucity of nanometre-scale ferromagnetic building blocks10 (in which electron spins are naturally aligned) from which spin-polarized electrons can be injected. Here we describe nanotubes of vanadium oxide (VOx), formed by controllable self-assembly11, that are ferromagnetic at room temperature. The as-formed nanotubes are transformed from spin-frustrated semiconductors to ferromagnets by doping with either electrons or holes, potentially offering a route to spin control12 in nanotube-based heterostructures13.

Date: 2004
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DOI: 10.1038/nature02970

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