Patent ID: 7126848

Claim:
A magnetic cell comprising: a first magnetically fixed part including a laminated structure where a first ferromagnetic layer, a nonmagnetic layer and a second ferromagnetic layer are laminated in this order, the first and second ferromagnetic layers being antiferromagnetically coupled via the nonmagnetic layer, and magnetizations of the first and second ferromagnetic layers being substantially fixed; a second magnetically fixed part including a third ferromagnetic layer whose magnetization is substantially fixed in a direction opposite to a direction of the magnetization of a closer one of the first and second ferromagnetic layers; a fourth ferromagnetic layer provided between the first and the second magnetically fixed part, a direction of magnetization of the fourth ferromagnetic layer being variable; a first intermediate layer provided between the first magnetically fixed part and the fourth ferromagnetic layer; and a second intermediate layer provided between the second magnetically fixed part and the fourth ferromagnetic layer, an easy axis of magnetization of the fourth ferromagnetic layer being substantially in parallel to the direction of the magnetization of the second ferromagnetic layer, and the direction of magnetization of the fourth ferromagnetic layer being determined under an influence of spin-polarized electrons upon the fourth ferromagnetic layer by passing a current between the first and the second magnetically fixed parts.