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We show that a quantum wire device with spin splitting can work as an activespin polarizer. Hot electrons in one `spin' subband (e.g. `spin-up') may passsuch a device with weak electron pair scattering, while electrons in theopposite subband (`spin-down') may have high conversion probability into the`spin-up' subband, resulting in spin polarization of a hot electron beam. Underdifferent circumstances a hot electron beam passing through a single modequantum wire may induce a steady state magnetization of the background electrongas in a section of the wire weakly coupled to the environment.Comment: 9 pages, LaTeX and APS-RevteX, Rep.No. GF65,Figures from autho

Spontaneous spin polarization of ballistic electrons in single-mode quantum wires due to spin splitting