Ferromagnetic decoration in metal-semiconductor separated and ferrocene functionalized single-walled carbon nanotubes

Autor(en)

A. Chernov, M. Havlicek, W. Jantsch, M.H. Rümmeli, A. Bachmatiuk, K. Yanagi, H. Peterlik, H. Kataura, Franz Sauerzopf, Roland Resel, Ferenc Simon, H. Kuzmany

Abstrakt

Spin resonance, magnetic measurements, and structural analysis are reported for metal-semiconductor separated SWCNTs after filling with ferrocene. Raman scattering performed after a heat treatment confirms partial transformation to double-walled CNTs but results from spin resonance (FMR), X-ray diffraction, and TEM evidence in addition the growth of ferromagnetic nanoparticles. For the metallic tubes the particles are identified as magnetite (Fe3O4) with full chemical stoichiometry. From the temperature dependence of the FMR response and from measurements of the magnetization by dc and ac SQUID the magnetite crystals are shown to undergo a Verwey transition. The transition temperature from the SQUID experiment is around 125?K as expected but considerably higher than observed from the FMR analysis. Results for semiconducting tubes are similar but magnetic particles are an order of magnitude smaller and exhibit different structures in addition to magnetite.

Organisation(en)

Elektronische Materialeigenschaften, Dynamik Kondensierter Systeme

Externe Organisation(en)

Johannes Kepler Universität Linz, Technische Universität Graz, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo Metropolitan University, Budapest University of Technology and Economics, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Technische Universität Wien

Journal

Physica Status Solidi. B: Basic Research

Band

249

Seiten

2323-2327

Anzahl der Seiten

5

ISSN

0370-1972

DOI

https://doi.org/10.1002/pssb.201200452

Publikationsdatum

12-2012

Peer-reviewed

Ja

ÖFOS 2012

103009 Festkörperphysik, 103015 Kondensierte Materie, 103018 Materialphysik

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/ferromagnetic-decoration-in-metalsemiconductor-separated-and-ferrocene-functionalized-singlewalled-carbon-nanotubes(03402e9c-0d67-414b-961d-40f5a8ff41b6).html