摘要:
A system and method to fabricate magnetic random access memory is disclosed. In a particular embodiment, the method includes depositing a cap layer on a magnetic tunnel junction (MTJ) structure, depositing a first spin-on material layer over the cap layer, and etching the first spin-on material layer and at least a portion of the cap layer.
摘要:
A method for forming a magnetic tunnel junction (MTJ) for magnetic random access memory (MRAM) using two masks includes depositing over an interlevel dielectric layer containing an exposed first interconnect metallization, a first electrode, a fixed magnetization layer, a tunneling barrier layer, a free magnetization layer and a second electrode. An MTJ structure including the tunnel barrier layer, free layer and second electrode is defined above the first interconnect metallization by a first mask. A first passivation layer encapsulates the MTJ structure, leaving the second electrode exposed. A third electrode is deposited in contact with the second electrode. A second mask is used to pattern a larger structure including the third electrode, the first passivation layer, the fixed magnetization layer and the first electrode. A second dielectric passivation layer covers the etched plurality of layers, the first interlevel dielectric layer and the first interconnect metallization.
摘要:
In a particular embodiment, a method is disclosed that includes forming a magnetic tunnel junction (MTJ) structure including a conductive layer on a substrate. The method also includes depositing a sacrificial layer on the conductive layer before depositing a patterning film layer.
摘要:
Systems, circuits and methods for determining read and write voltages for a given word line transistor in Spin Transfer Torque Magnetoresistive Random Access Memory (STT-MRAM) are disclosed. A first voltage can be supplied to the write operations so that the write operations occur in the saturation region of the word line transistor. A second voltage, which is less than the first voltage, can be supplied for read operations so that the read operations occur in the linear region of the word line transistor.
摘要:
An integrated circuit device incorporating a metallurgical bond to enhance thermal conduction to a heat sink. In a semiconductor device, a surface of an integrated circuit die is metallurgically bonded to a surface of a heat sink. In an exemplary method of manufacturing the device, the upper surface of a package substrate includes an inner region and a peripheral region. The integrated circuit die is positioned over the substrate surface and a first surface of the integrated circuit die is placed in contact with the package substrate. A metallic layer is formed on a second opposing surface of the integrated circuit die. A preform is positioned on the metallic layer and a heat sink is positioned over the preform. A joint layer is formed with the preform, metallurgically bonding the heat sink to the second surface of the integrated circuit die.
摘要:
Method and test structures for determining heating effects in a test semiconductor device (10) are provided. The test device may include a first conductive metal structure (151–156) for accepting a flow of electric current that causes a heating effect. The test device may further include a second conductive metal structure proximate (121–126) the first conductive structure for obtaining resistivity changes in response to the heating effect. The resistivity changes are indicative of temperature changes due to the heating effect.
摘要:
The present invention provides a method of forming an electromigration resisting layer in a semiconductor device. In an exemplary embodiment, the method comprises depositing a corrosion inhibitor comprising an organic ligand on a conductive layer of a semiconductor device wherein the conductive layer is susceptible to electromigration. The method further includes subjecting the corrosion inhibitor and the semiconductor device to a high temperature anneal to form an electromigration resisting layer on the conductive layer that reduces electromigration of the conductive layer.
摘要:
Systems, circuits and methods for controlling word line (WL) power levels at a WL of a Magnetoresistive Random Access Memory (MRAM). The disclosed power control scheme uses existing read/write commands and an existing power generation module associated with the MRAM to supply and control WL power levels, thereby eliminating the cost and increased die-size of schemes that control WL power through relatively large and expensive power control switches and control circuitry on the MRAM macro.
摘要:
A magnetic tunnel junction storage element for a spin transfer torque magnetoresistive random access memory (STT-MRAM) bit cell includes a bottom electrode layer, a pinned layer adjacent to the bottom electrode layer, a dielectric layer encapsulating a portion of the bottom electrode layer and the pinned layer, the dielectric layer including sidewalls that define a hole adjacent to a portion of the pinned layer, a tunneling barrier adjacent to the pinned layer, a free layer adjacent to the tunneling barrier, and a top electrode adjacent to the free layer, wherein a width of the bottom electrode layer and/or the pinned barrier in a first direction is greater than a width of a contact area between the pinned layer and the tunneling barrier in the first direction. Also a method of forming an STT-MRAM bit cell.
摘要:
A Multi-Level Memory Cell (MLC) using multiple Magnetic Tunnel Junction (MTJ) structures having one or more layers with varying thickness is disclosed. The multiple MTJ structures, which are vertically stacked and arranged in series, may have substantially identical area dimensions to minimize fabrication costs because one mask can be used to pattern the multiple MTJ structures. Further, varying the thicknesses associated with the one or more layers may provide the multiple MTJ structures with different switching current densities and thereby increase memory density and improve read and write operations. In one embodiment, the layers with the varying thicknesses may include tunnel barriers or magnesium oxide layers associated with the multiple MTJ structures and/or free layers associated with the multiple MTJ structures.