A magnetic device comprises first through third ferromagnetic
layers, first and second intermediate
layers and a couple of electrodes. The first ferromagnetic layer includes magnetic
layers and one or more nonmagnetic layers which are alternately stacked, at least one layer of the magnetic layers has
magnetization substantially fixed to a first direction, and two or more layers of the magnetic layers are ferromagnetically coupled via the nonmagnetic layers while having easy axes of
magnetization parallel to a
film plane. The second ferromagnetic layer has
magnetization substantially fixed to a second direction. The third ferromagnetic layer is provided between the first ferromagnetic layer and the second ferromagnetic layer. The third ferromagnetic layer has a variable direction of magnetization. The first and second intermediate layers are provided between the ferromagnetic layers. The electrodes are configured to provide
write current between the first and second ferromagnetic layers to cause spin-polarized electrons to act on the third ferromagnetic layer so that the direction of magnetization of the third ferromagnetic layer is determined depending on a direction of the current. The ferromagnetic
coupling has a strength such that a parallel magnetic alignment of the magnetic layers is maintained when the
write current.