中央研究院 原子與分子科學研究所

Electrons may experience inelastic coupling with the organic spacer layer during tunneling between two ferromagnetic electrodes.
To probe the transport behavior of spin-polarized electrons in organic materials, organic spin valves were fabricated utilizing
a relatively thin organic barrier of 3,4,9,10-perylene-teracarboxylicdianhydride (PTCDA) dusted with alumina at the organic/ferromagnetic interfaces.
These structures, with an organic barrier layer, exhibited magnetoresistance up to 12% at room temperature.
In studies of the inelastic tunneling spectrum, the observed characteristic peak of the organic layer provides direct evidence of the
interplay between the spin-polarized electrons and the organic molecules.
Combining the inelastic tunneling results with a simple molecular vibration calculation yields further information on the configuration
of the molecular thin film and the possible tunneling states of the spin-polarized electrons.
Such interplay indicates a true transport of spin-polarized electrons through organic material rather than through
defects or interdiffusion compounds formed at the interfaces within the organic spin valve.

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