Patent ID: 7994555

Claim:
A spin transistor comprising: a semiconductor substrate including a channel layer; ferromagnetic source and drain disposed on the semiconductor substrate to be separated from each other and to be magnetized in a direction perpendicular to a top surface of the channel layer; a gate formed on the semiconductor substrate between the source and the drain to adjust spins of electrons passing through the channel layer; wherein spin-polarized electrons are injected from the source into the channel layer and the electrons injected into the channel layer pass through the channel layer and are injected into the drain; wherein the spins of the electrons passing though the channel layer undergo precession due to a spin-orbit coupling induced magnetic field according to a voltage of the gate; wherein the source and drain have magnetocrystalline anisotropy where an easy-crystallization axis is perpendicular to the top surface of the channel layer; and wherein magnetic directions of the ferromagnetic source and drain are fixed during all device operations in both states of ON and OFF.