Patent ID: 8026561

Claim:
A spin MOSFET, comprising: a source unit and a drain unit provided at a distance from each other on a semiconductor substrate, one of the source unit and the drain unit comprising a first ferromagnetic stacked film that includes a first ferromagnetic layer having a fixed magnetization direction perpendicular to a film plane, the other one of the source unit and the drain unit comprising a second ferromagnetic stacked film that includes a second ferromagnetic layer having a variable magnetization direction perpendicular to a film plane, a first tunnel barrier provided on the second ferromagnetic layer, and a third ferromagnetic layer provided on the first tunnel barrier and having a fixed magnetization direction perpendicular to a film plane and antiparallel to the magnetization direction of the first ferromagnetic layer; a gate insulating film provided on a portion of the semiconductor substrate, the portion being located between the source unit and the drain unit; a gate electrode provided on the gate insulating film; a first hard bias film provided above the gate electrode; a second hard bias film provided above a portion of the semiconductor substrate, the portion being located on a first side of the source unit, the first side being opposite to a second side on which the first hard bias film is disposed; and a third hard bias film provided above a portion of the semiconductor substrate, the portion being located on a third side of the drain unit, the third side being opposite to a fourth side on which the first hard bias film is disposed, magnetization directions of the first through third hard bias films being parallel to the magnetization direction of the third ferromagnetic layer.