6533b7d1fe1ef96bd125c41c

RESEARCH PRODUCT

Proposal for a Dual Spin Filter Based on [VO(C 3 S 4 O) 2 ] 2–

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Polynuclear magnetic molecules often present dense electronic transmission spectra with many overlapping conduction spin channels. Single-metal complexes display a sparser density of states, which in the presence of a fixed external magnetic field makes them interesting candidates for spin filtering. Here we perform a DFT study of a family of bis- and tris-dithiolate vanadium complexes sandwiched between Au(111) electrodes and demonstrate that [VO(C3S4O)2]2– can behave as a dual spin filter. This means that an external electrical stimulus can switch between the selective transmission of spin-up and spin-down carriers. By using an electrostatic gate, we show that the onset for the spin-up conductance is at a voltage Vg = −0.51 V, but a small shift to Vg = −0.63 V is capable of switching to spin-down transport. For both cases, we estimate a large low-bias conductance (approximately 2 μS at Vbias 99.5%). We conclude by commenting on the general molecular requirement...