Compact proximity focused vacuum tubes with GaAs(Cs,O) photocathodes are used for experimental studying spindependent
phenomena. Firstly, spin-dependent emission of optically oriented electrons from p-GaAs(Cs,O) into vacuum
in a magnetic field normal to the surface was observed in a nonmagnetic vacuum diode. This phenomenon is explained
by the jump in the electron g-factor at the semiconductor-vacuum interface. Due to this jump, the effective electron
affinity on the semiconductor surface depends on the mutual direction of optically oriented electron spins and the
magnetic field, resulting in the spin-dependent photoemission. It is demonstrated that the observed effect can be used for
the determination of spin diffusion length in semiconductors. Secondly, we developed a prototype of a new spin filter,
which consists of a vacuum tube with GaAs(Cs,O) photocathode and a nickel-covered venetian blind dynode.
Preliminary results on spin-dependent reflection of electrons from the oxidized polycrystal nickel layer are presented.
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