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Tuning electronic transport in cobalt-filled carbon nanotubes using magnetic fields
Francesco Rossella1, Caterina Soldano, Pasquale Onorato
1Dipartimento di Fisica, Università degli Studi di Pavia, Via Bassi 6, 27100 Pavia, Italy. francesco.rossella@unipv.it.
Nanoscale
|November 22, 2013
Summary
Controlling electrical conduction in ferromagnetic metal-filled carbon nanotubes with magnetic fields reveals unique, dimension-dependent behaviors. This opens possibilities for advanced magnetic sensors and nanoelectronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Carbon nanotubes (CNTs) are quasi one-dimensional materials with significant potential.
- Metal-filled CNTs offer hybrid properties for advanced applications.
Purpose of the Study:
- To investigate the control of electrical conduction in ferromagnetic metal-filled CNTs using external magnetic fields.
- To explore dimensionality-dependent conduction regimes and their implications.
Main Methods:
- Fabrication of ferromagnetic metal-filled carbon nanotubes.
- Measurement of electrical conduction under varying magnetic fields and temperatures.
- Analysis of magneto-conductance and current-temperature dependence.
Main Results:
- Electrical conduction in these CNTs can be precisely controlled by external magnetic fields.
- Positive to negative magneto-conductance transitions indicate channel-selective conduction.
- Zero-field current temperature dependence reveals distinct regimes linked to inter-shell hopping and cobalt clusters.
Conclusions:
- Ferromagnetic metal-filled CNTs exhibit tunable electrical properties influenced by magnetic fields and dimensionality.
- Inter-shell hopping assisted by magnetic clusters plays a crucial role in dimensional crossover.
- These findings enable the development of tunable hybrid nano-sensors and multifunctional magnetic devices.
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