Patent ID: 7224601
Filing Date: 2007-05-29
Classification: B82Y,G11C,H01F

Abstract:
1. A magnetic memory device, comprising: a memory cell comprising a magnetic tunnel junction which comprises a free magnetic layer, a pinned magnetic layer and a spacer layer which is nonmagnetic and located between the pinned magnetic layer and the free magnetic layer; a first mechanism to apply an AC current to produce an oscillating magnetic field at an oscillating frequency in resonance with a magnetic resonance frequency of the free magnetic layer and to magnetically couple the oscillating magnetic field to the free magnetic layer; and a second mechanism to apply a DC current across the magnetic tunnel junction of the memory cell to cause a spin transfer torque in the free magnetic layer, wherein a magnitude of each of the oscillating magnetic field by the AC current and the spin transfer torque by the DC current alone and without the other is less than a threshold for changing a magnetization direction of the free magnetic layer.