Resonant magnetoresistance in organic spin-valves

Details Resonant magnetoresistance in organic spin-valves Resonant magnetoresistance in organic spin-valves

2006-10-31

arxiv.org/abs/cond-mat/0610866v1

Physics

Condensed Matter

Materials Science

6 pages, 5 figures, http://www.smeagol.tcd.ie

Scientific paper

We investigate theoretically the effects of surface states over the magnetoresistance of Ni-based organic spin-valves. In particular we perform {\it ab initio} electronic transport calculations for a benzene-thiolate molecule chemically attached to a Ni [001] surface and contacted either by Te to another Ni [001] surface, or terminated by a thiol group and probed by a Ni STM tip. In the case of S- and Te-bonded molecules we find a large asymmetry in the spin-currents as a function of the bias, although the $I$-$V$ is rather symmetric. This leads to a smooth although not monotonic dependence of the magnetoresistance over the bias. In contrast, in the case of a STM-type geometry we demonstrate that the spin-current and the magnetoresistance can be drastically changed with bias. This is the result of a resonance between a spin-polarized surface state of the substrate and the $d$-shell band-edge of the tip.

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