Magnetic cell and magnetic memory

A magnetic cell comprising:

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

A magnetic cell comprising:

• a first magnetically fixed part including a first ferromagnetic layer whose magnetization is substantially fixed in a first direction;
• a second magnetically fixed part including a second ferromagnetic layer whose magnetization is substantially fixed in a second direction opposite to the first direction;
• a third ferromagnetic layer provided between the first and the second ferromagnetic layers, a direction of magnetization of the third ferromagnetic layer being variable;
• a first intermediate layer provided between the first and the third ferromagnetic layers;
• and
• a second intermediate layer provided between the second and the third ferromagnetic layers,
• the direction of magnetization of the third ferromagnetic layer being determined under an influence of spin-polarized electrons upon the third ferromagnetic layer by passing a current between the first and the second ferromagnetic layers,
• the first magnetically fixed part including a fourth ferromagnetic layer and a nonmagnetic layer, and
• the magnetization of the first ferromagnetic layer being ferromagnetically fixed by the fourth ferromagnetic layer via the nonmagnetic layer.