Patent ID: 8093668

Claim:
A magnetoresistive random access memory comprising: a substrate formed of a semiconductor; a first magnetoresistive effect element which is provided above the substrate and takes two steady states with different resistance values by a magnetoresistive effect, a shape of the first magnetoresistive effect element, which is projected on an upper surface of the substrate, comprising a first ellipse with a first minor axis and a first major axis, and a ratio of the first major axis to the first minor axis being a first value; and a second magnetoresistive effect element which is provided above the substrate, is used to determine a resistance state of the first magnetoresistive effect element and takes two steady states with different resistance values by a magnetoresistive effect, a shape of the second magnetoresistive effect element, which is projected on the upper surface of the substrate, comprising a second ellipse with a second minor axis and a second major axis, and a ratio of the second major axis to the second minor axis being a second value which is greater than the first value, a sense amplifier which has a first input terminal and a second input terminal and amplifies a difference between a voltage or a current of the first input terminal and a voltage or a current of the second input terminal, wherein when information, which is stored in the first magnetoresistive effect element, is read, one end of the first magnetoresistive effect element is electrically connected to the first input terminal, and one end of the second magnetoresistive effect element is electrically connected to the second input terminal, a first wiring line connected between said one end of the first magnetoresistive effect element and the first input terminal; a second wiring line connected between said one end of the second magnetoresistive effect element and the second input terminal; a first current source which supplies a read current to the first wiring line; and a second current source which supplies a read current to the second wiring line, wherein a width of the first ellipse along the first minor axis is equal to a width of the first wiring line, and a width of the second ellipse along the second minor axis is equal to a width of the second wiring line.