The spin relaxation time (τ) on the spin transport in thermally evaporated thin films of a naphthyl diamine derivative: N, N′-Bis(naphthalen-1-yl)-N, N′-bis(phenyl)-2,2′-dimethylbenzidine (α-NPD) was evaluated with the spin-pump-induced spin transport properties and the electrical current-voltage properties in α-NPD films. The zero-bias mobility and the diffusion constant of charges in α-NPD films were obtained to be (1.1 ± 0.4) × 10⁻³ cm²/Vs and (3 ± 1) × 10⁻⁵ cm²/s, respectively. Using these values and the previously evaluated spin diffusion length in α-NPD films of 62 ± 18 nm, the τ in α-NPD films was estimated to be 2 ± 1 μs at room temperature, under an assumption of diffusive transport of the spin current in α-NPD films. This estimated τ in α-NPD films is long enough for practical use as a spintronic molecular material.

萘二胺衍生物热蒸发薄膜中自旋输运的自旋弛豫时间 ( τ )： N , N '-Bis(nathalen-1-yl)- N , N '-bis(苯基)-2,2'通过自旋泵诱导的自旋输运特性和 α-NPD 薄膜中的电流-电压特性评估-二甲基联苯胺 (α-NPD)。α-NPD薄膜的零偏压迁移率和扩散常数分别为(1.1±0.4)×10 ^-3  cm ² /Vs和(3±1)×10 ^-5  cm ² /s。使用这些值和先前评估的 α-NPD 薄膜中的自旋扩散长度 62 ± 18 nm，在假设自旋电流扩散传输的情况下，α-NPD 薄膜中的τ在室温下估计为 2 ± 1 μs在 α-NPD 薄膜中。α-NPD 薄膜中的估计τ足够长，足以作为自旋电子分子材料实际使用。