Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 21, Issue 2-4, Pages 996-1001Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2003.11.158
Keywords
spin transistor; hot electron transistor; spin-filter; magnetocurrent ratio
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We propose and theoretically analyze a spin-filter transistor (SFT) employing a spin-filter effect in a ferromagnetic barrier layer. The proposed SFT has a turmeling-injection-type hot-electron-transistor structure with a thin ferromagnetic emitter barrier and a thick ferromagnetic collector barrier. The emitter barrier acts as a tunneling-injector of highly spin-polarized hot electrons from the nonmagnetic emitter to the nonmagnetic base, and the collector barrier acts as a spin analyzer that determines the flow of spin-polarized hot electrons from the base to the nonmagnetic collector or to the base electrode. By the combination of these two spin-filters, the output characteristics of the SFT depend on the magnetic configuration (parallel or antiparallel) of the emitter and collector barriers. The SFT can realize not only a very large magnetocurrent ratio, but also current and power gains, which are definitely needed for the design of integrated circuits. (C) 2003 Elsevier B.V. All rights reserved.
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