Patent ID: 8750034

Claim:
A magnetoresistance element comprising: a first magnetoresistance subelement including a first free magnetization layer, a first tunnel insulating layer and a first fixed magnetization layer, the first tunnel insulating layer interposed between the first free magnetization layer and the first fixed magnetization layer, a magnetization direction of the first free magnetization layer changing according to an electric current flowing in a thickness direction of the first magnetoresistance subelement, and a resistance of the first magnetoresistance subelement changing between a low resistance state and a high resistance state according to the magnetization direction of the first free magnetization layer; and a second magnetoresistance subelement including a second free magnetization layer, a second tunnel insulating layer and a second fixed magnetization layer, the second tunnel insulating layer interposed between the second free magnetization layer and the second fixed magnetization layer, a magnetization direction of the second free magnetization layer changing according to an electric current flowing in a thickness direction of the second magnetoresistance subelement, and a resistance of the second magnetoresistance subelement changing between a low resistance state and a high resistance state according to the magnetization direction of the second free magnetization layer, wherein the first and second magnetoresistance subelements are stacked each other, an order of the first free magnetization layer and the first fixed magnetization layer is opposite to an order of the second free magnetization layer and the second fixed magnetization layer in a thickness direction of the magnetoresistance element, the first magnetoresistance subelement is in the low resistance state having a first resistance value when the magnetization direction of the first free magnetization layer is identical with a magnetization direction of the first fixed magnetization layer, the first magnetoresistance subelement is in the high resistance state having a second resistance value larger than the first resistance value when the magnetization direction of the first free magnetization layer is opposed to the magnetization direction of the first fixed magnetization layer, the second magnetoresistance subelement is in the low resistance state having a third resistance value when the magnetization direction of the second free magnetization layer is identical to a magnetization direction of the second fixed magnetization layer, the second magnetoresistance subelement is in the high resistance state having a fourth resistance value larger than the third resistance value when the magnetization direction of the second free magnetization layer is opposed to the magnetization direction of the second fixed magnetization layer, and a sum of the first resistance value and the fourth resistance value is unequal to a sum of the second resistance value and the third resistance value.