Abstract
The spin-polarized scanning tunneling microscope (SP-STM) has been expected to get information concerning magnetic domains and surface spin structures with atomic spatial resolution. The development of nonmagnetic GaAs tips is an attractive technique for the SP-STM. Because there is no magnetic interaction between the GaAs tip and the magnetic sample. In addition, spin polarization of electrons in the GaAs conduction band can be easily controlled by optically pumping using circularly polarized light. Recently, the cleaved GaAs wafer has been attempted as a SP-STM tip [1]. In this study, GaAs microtips with several micron-meter size were successfully fabricated, and, the spin-dependent tunneling current could be observed by using optically pumped GaAs microtips.
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