Patent ID: 9275713
Filing Date: 2016-03-01
CPC Classification: G11C,H01L

Claim Text:
1. A spin-transfer torque magnetoresistive memory comprising at least one memory cell comprising: a digital line provided on a surface of a substrate serving as a bottom electrode; a dielectric functional layer provided on the top surface of the digital line layer; a magnetic soft adjacent layer provided on the top surface of the dielectric functional layer having a magnetic shape anisotropy along a first direction in a surface plane and an induced perpendicular anisotropy from a interface interaction with the functional layer and having a variable magnetization direction; a conductive layer provided on the top surface of the soft adjacent layer, serving as a middle electrode; a MTJ stack provided on the top surface of the conductive layer and overlaid above the conductive layer and magnetic soft adjacent layer; a bit line provided on the top surface of the MTJ stack; a CMOS transistor coupled the plurality of magnetoresistive memory elements through the middle electrode; the MTJ stack further comprises: a recording layer provided on the top surface of the conductive layer having a magnetic shape anisotropy along the first direction in a surface plane and having a variable magnetization direction and forming a flux closure with the soft adjacent layer; a tunnel barrier layer provided on the top surface of the recording; a reference layer on the top surface of the tunnel barrier layer having magnetic anisotropy along the first direction and invariable magnetization direction in a surface plane; a coupling spacing layer on the top surface of the reference layer; a pinned layer on the top surface of the coupling spacing layer having magnetic anisotropy along the first direction and invariable magnetization direction in a surface plane; an antiferromagnetic layer on the top surface of the pinned layer; a cap layer on the top surface of the antiferromagentic layer; and there is further provided a control circuitry coupled through the bit line, the digital line and the select transistor to selected ones of the plurality of magnetoresistive memory elements, configured to provide a bi-directional spin-transfer recording current between the bit line and the select transistor and to provide a negative voltage on the digital line to generate a electric field on the dielectric functional layer and pointing downwards along the thickness direction to enhance a perpendicular anisotropy in the soft adjacent layer in a recording operation, configured to provide a reading current between the bit line and the select transistor in a reading operation.