Spin transistor, programmable logic circuit, and magnetic memory

A spin transistor, comprising:

• a non-magnetic semiconductor substrate having a channel region, a first area, and a second area, a surface of the non-magnetic semiconductor substrate including surfaces of the channel region and the first and second areas, and the channel region being between the first area and the second area;
• a first tunnel barrier film located on the first area;
• a first conductive layer located on the first tunnel barrier and made of a ferromagnetic material magnetized in a first direction;
• a second conductive layer located above the second area and made of a ferromagnetic material magnetized in one of the first direction and a second direction, electron spins being passed between the first conductive layer and the second conductive layer through the first tunnel barrier and the channel region, the first direction being a direction perpendicular to a direction in which the electron spins pass through the channel region, the second direction being antiparallel with respect to the first direction;
• an insulating film located on the channel region;
• and
• a gate electrode located on the insulating film.