Highly efficient (Cs < inf> 8 V) superatom-based spin-polarizer

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Quantum transport through molecules and the possibility to manipulate spin has generated tremendous excitement. Here, we demonstrate unusual spin transport through a molecule of two Cs8 V magnetic superatoms. Calculations based on density functional theory and nonequilibrium Green's function methods find a much higher current for the spin-down charge carriers relative to the spin-up carriers in the model Au- (Cs8 V) - (Cs8 V) -Au device system with almost 100% spin polarization, indicating a highly efficient spin polarizer. The new behavior is rooted in strong coupling of the localized magnetic core on V and the itinerant electrons of the Cs shell atoms leading to nearly full spin polarization. © 2009 American Institute of Physics.

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Applied Physics Letters