Patent ID: 7696548

Claim:
An MRAM structure, comprising: (a) a magnetic tunnel junction (MTJ) sensing element having length and width dimensions and formed on a conductive substrate, said MTJ has a first stack of layers comprised of a ferromagnetic layer with a magnetization direction along a first axis, a super-paramagnetic (SP) free layer in which a remnant magnetization is substantially zero in the absence of an external field, and in which magnetization is roughly proportional to an external field until reaching a saturation value, and an insulating layer formed between the ferromagnetic layer and SP free layer; and (b) a storage layer having anisotropy, an easy axis, and a uniaxial magnetization along the first axis that is aligned parallel or anti-parallel to the magnetization direction of the ferromagnetic layer to determine a digital storage value of “0” or “1”, respectively, said planar storage layer is separated from said SP free layer and the MTJ and is formed along a plane that is parallel to the planar conductive substrate.