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Beilstein J Nanotechnol. 2012;3:589-96. Epub 2012 Aug 22.

Strong spin-filtering and spin-valve effects in a molecular V-C(60)-V contact.

Author information

1
Hybrid Materials Interfaces Group, Faculty of Production Engineering and Bremen Center for Computational Materials Science, University of Bremen, 28359 Bremen, Germany.

Abstract

Motivated by the recent achievements in the manipulation of C(60) molecules in STM experiments, we study theoretically the structure and electronic properties of a C(60) molecule in an STM tunneljunction with a magnetic tip and magnetic adatom on a Cu(111) surface using first-principles calculations. For the case of a vanadium tip/adatom, we demonstrate how spin coupling between the magnetic V atoms, mediated by the C(60), can be observed in the electronic transport, which display a strong spin-filtering effect, allowing mainly majority-spin electrons to pass (>95%). Moreover, we find a significant change in the conductance between parallel and anti-parallel spin polarizations in the junction (86%) which suggests that STM experiments should be able to characterize the magnetism and spin coupling for these systems.

KEYWORDS:

fullerene; molecular spintronics; scanning tunneling microscopy; spin transport

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