Patent ID: 6696737
Filing Date: 2004-02-24
Classification: B82Y,G01R,G11C,H01F,H01L

Abstract:
A unipolar spin transistor comprising:a. a first semiconductor region having a conductivity type and a first spin polarization; b. a second semiconductor region having a conductivity type that is the same conductivity type of the first semiconductor region and a second spin polarization that is different from the first spin polarization of the first semiconductor region; and c. a third semiconductor region having a conductivity type that is the same conductivity type of the first semiconductor region and the first spin polarization, wherein the first semiconductor region and the second semiconductor region are adjacent to each other so as to form a first spin depletion layer therebetween, the first spin depletion layer having a first side facing the first semiconductor region and an opposing second side facing the second semiconductor region, wherein the second semiconductor region and the third semiconductor region are adjacent to each other so as to form a second spin depletion layer therebetween, the second spin depletion layer having a first side facing the second semiconductor region and an opposing second side facing the third semiconductor region, wherein when a majority carrier in the first semiconductor region moves across the first spin depletion layer from the first side of the first spin depletion layer to the second side of the first spin depletion layer, the majority carrier in the first semiconductor region becomes a minority carrier in the second semiconductor region, and when the minority carrier in the second semiconductor region moves across the second spin depletion layer from the first side of the second spin depletion layer to the second side of the second spin depletion layer, the minority carrier in the second semiconductor region becomes a majority carrier in the third semiconductor region.