Giant magnetoresistance of multiwall carbon nanotubes: modeling the tube/ferromagnetic-electrode burying contact

Abstract

We report on the giant magnetoresistance (GMR) of multiwall carbon nanotubes with ultra small diameters. In particular, we consider the effect of the inter-wall interactions and the lead/nanotube coupling. Comparative studies have been performed to show that in the case when all walls are well coupled to the electrodes, the so-called inverse GMR can appear. The tendency towards a negative GMR depends on the inter-wall interaction and on the nanotube le ngth. If, however, the inner nanotubes are out of contact with one of the electrodes, the GMR remains positive even for relatively strong inter-wall interactions regardless of the outer nanotube length. These results shed additional light on recently reported experimental data, where an inverse GMR was found in some multiwall carbon nanotube samples.

5 pages, 5 figures

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• Fractional quantum conductance in carbon nanotubes
• First-principles phase-coherent transport in metallic nanotubes with realistic contacts
• Carbon Nanotube Based Magnetic Tunnel Junctions
• Electronic structure of polychiral carbon nanotubes
• Interference effects in electronic transport through metallic single-wall carbon nanotubes
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• Controlling spin in an electronic interferometer with spin-active interfaces
• Spin-polarized transport through carbon nanotubes
• Tunnel Magnetoresistance of a Single-Molecule Junction
• Spin valve effect in two-dimensional VSe${}_2$ system
• Spin transport in disordered single-wall carbon nanotubes contacted to ferromagnetic leads
• Ballistic magnetoresistance in small-size carbon nanotubes devices