Abstract
We performed spin-polarized scanning tunneling spectroscopy (SP-STS) on the optically pumped GaAs(110) surface with the Fe-coated W tip to investigate the spin-polarized tunneling effect between them. The optical effects that could be superimposed on the spin-dependent signal were carefully investigated with the nonmagnetic W tip. In the SP-STS experiment, the intensity and circular-polarization of the light were simultaneously modulated, and the modulation signals of the tunneling current were compared in order to distinguish the spin dependent component. We demonstrated that the spin-dependent tunneling effect could be detected when we carefully choose the energy range to avoid the parasitic optical effect.
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