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US09054297B2 Magnetic random access memory integration having improved scaling 有权
磁性随机存取存储器集成具有改进的缩放

Magnetic random access memory integration having improved scaling
Abstract:
A conductive via for connecting between a digit line and one side of the magnetic device is positioned beneath, and aligned with, each magnetic device. Other contacts may satisfy the same design rules, using the same process step. An electrode formed on the conductive via is polished to eliminate step functions or seams originating at the conductive via from propagating up through the various deposited layers. This integration approach allows for improved scaling of the MRAM devices to at least a 45 nanometer node, a cell packing factor approaching 6F2, and a uniform thickness of material between the bit lines and the underlying memory elements.
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