ESR evidence for disordered magnetic phase from ultra-small carbon nanotubes embedded in zeolite nanochannels
Department of Physics and INPAC-Institute for Nanoscale Physics and Chemistry, University of Leuven Celestijnenlaan 200 D, B-3001 Leuven, Belgium, EU
2 Department of M²S, Centre for Surface Science and Catalysis, KU Leuven - Kasteelpark Arenberg 23, B-3001 Heverlee, Belgium, EU
Corresponding author: Srinivasarao.firstname.lastname@example.org
Accepted: 31 May 2010
A multi-frequency electron spin resonance (ESR) study provides evidence for the occurrence of low-temperature ferromagnetic/spin-glass behavior in aligned arrays of sub-nanometer single-walled carbon nanotubes confined in zeolite nanochannels, owing to -type non-bonding carbon-associated localized states with density of ≈ 3× 1019/g. Features related to the much anticipated conduction ESR are not detected. In the paramagnetic phase, the ESR linewidth is found to be weakly dependent on microwave frequency.
PACS: 73.63.Fg – Nanotubes / 75.50.Lk – Spin glasses and other random magnets / 76.30.Mi – Color centers and other defects
© EPLA, 2010