Nanotechnology 23, 015707 (2012)

J. Barzola-Quiquia, N. Klingner, J. Krüger, A. Molle, P. Esquinazi, A. Leonhardt, and M. T. Martinez

Abstract

We report on the electrical transport properties of single multiwall carbon nanotubes with and
without an iron filling as a function of temperature and magnetic field. For the iron filled
nanotubes the magnetoresistance shows a magnetic behavior induced by iron, which can be
explained by taking into account a contribution of s–d hybridization. In particular,
ferromagnetic-like hysteresis loops were observed up to 50 K for the iron filled multiwall
carbon nanotubes. The magnetoresistance shows quantum interference phenomena such as
universal conductance fluctuations and weak localization effects.