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The spin relaxation time (tau) on the spin transport in thermally evaporatedthin films of a naphthyl diamine derivative: N, N'-Bis(naphthalen-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine (a-NPD) was evaluated with thespin-pump-induced spin transport properties and the electrical current-voltageproperties in a-NPD films. The zero-bias mobility and the diffusion constant ofcharges in a-NPD films were obtained to be about 1.2*10-3 cm2/Vs and about3.0*10-5 cm2/s, respectively. Using these values and the previously evaluatedspin diffusion length in a-NPD films of about 62 nm, the tau in a-NPD films wasestimated to be about 1.9 micro-second at room temperature, under an assumptionof diffusive transport of the spin current in a-NPD films. This estimated tauin a-NPD films is long enough for practical use as a spintronic molecularmaterial.

Spin current relaxation time in thermally evaporated naphthyl diamine derivative films