Contact-induced spin polarization in carbon nanotubes

Details Contact-induced spin polarization in carbon nanotubes Contact-induced spin polarization in carbon nanotubes

2003-11-28

arxiv.org/abs/cond-mat/0311637v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Phys. Rev. B (2003)

Scientific paper

10.1103/PhysRevB.69.035407

Motivated by the possibility of combining spintronics with molecular structures, we investigate the conditions for the appearance of spin-polarization in low-dimensional tubular systems by contacting them to a magnetic substrate. We derive a set of general expressions describing the charge transfer between the tube and the substrate and the relative energy costs. The mean-field solution of the general expressions provides an insightful formula for the induced spin-polarization. Using a tight-binding model for the electronic structure we are able to estimate the magnitude and the stability of the induced moment. This indicates that a significant magnetic moment in carbon nanotubes can be observed.

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