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We find extraordinary behavior of the local two-terminal spin accumulationsignals in ferromagnet (FM)/semiconductor (SC) lateral spin-valve devices. Withrespect to the bias voltage applied between two FM/SC Schottky tunnel contacts,the local spin-accumulation signal can show nonmonotonic variations, includinga sign inversion. A part of the nonmonotonic features can be understoodqualitatively by considering the rapid reduction in the spin polarization ofthe FM/SC interfaces with increasing bias voltage. In addition to the signinversion of the FM/SC interface spin polarization, the influence of thespin-drift effect in the SC layer and the nonlinear electrical spin conversionat a biased FM/SC contact are discussed.

Nonmonotonic bias dependence of local spin accumulation signals in ferromagnet/semiconductor lateral spin-valve devices