Patent ID: 6946712

Claim:
A magnetic memory device comprising: an SOI substrate having a first semiconductor layer, a first insulating film formed on the first semiconductor layer, and a second semiconductor layer formed on the first insulating film; an element isolation insulating film formed selectively in the second semiconductor layer and extending from a surface of the second semiconductor layer with a depth reaching the first insulating film; a diode formed in the second semiconductor layer; a magneto-resistive element connected to the diode; a first wiring extending in a first direction at a distance below the magneto-resistive element; and a second wiring formed on the magneto-resistive element and extending in a second direction different from the first direction, wherein the diode comprises: a gate electrode formed on the second semiconductor layer with a gate insulating film interposed; a first diffusion layer of a first conductivity type that is formed in a portion of the second semiconductor layer, which is located near one end of the gate electrode, the first diffusion layer being concentrated to the magneto-resistive element; and a second diffusion layer of a second conductivity type that is formed in a portion of the second semiconductor layer, which is located near the other end of the gate electrode.