Patent ID: 8053851

Claim:
A spin transistor, comprising: a semiconductor substrate having a channel layer formed therein; a ferromagnetic source and a drain epitaxially grown on the semiconductor substrate and magnetized in a longitudinal direction of the channel layer due to magnetocrystalline anisotropy, the source and drain being disposed spaced apart from each other in the channel direction and magnetized in the same direction to each other; and a gate disposed between the source and the drain insulated with the semiconductor substrate and formed on the semiconductor substrate to control the spin direction of electrons passing through the channel layer; wherein the source and drain have an easy magnetization axis parallel to a longitudinal direction of the channel layer due to the magnetocrystalline anisotropy; and wherein an upper portion of the semiconductor substrate is formed of GaAs, the source and drain are formed of hexagonal close packed cobalt (hcp-Co), and a c axis of the hcp-Co is directed toward a [1 1 0] direction of the GaAs.