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Spin switch and spin amplifier: magnetic bipolar transistor in the saturation regime

Fabian, Jaroslav ; Zutic, Igor


It is shown that magnetic bipolar transistors (MBT) can amplify currents even in the saturation regime, in which both the emitter-base and collector-base junctions are forward biased. The collector current and the current gain can change sign as they depend on the relative orientation of the equi- librium spin in the base and on the nonequilibrium spin in the emitter and collector. The predicted ...


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