Using the mode-matching method, spin-dependent electron transport properties in multichannel ferromagnet/semiconductor/ferromagnet nanowires are studied. The significant quantum confinement and Rashba spin-orbit interaction are considered simultaneously. As the width of the wire varies, corresponding channels for electrons are opened, and the conductance oscillates as a function of the length of the semiconductor. As the strength of the spin-orbit interaction increases, the phase of the conductance changes and the resonant peaks shift to the right. When two electron channels are open, the conductance oscillates anomalously and the polarization becomes smaller than that for only one open channel.

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