| 摘要 |
An asymmetric cell and bit design for an MRAM device. The design is asymmetrical with respect to the easy-axis of the cell and has a centroid displaced from bit center along the hard-axis of the cell. This asymmetry is large enough so that manufacturing process variations do not substantially change the switching fields of the bits. In addition, the asymmetry causes the ends of the bits to align in opposite directions in small half-select fields and parallel to each other at large half-select fields, which increases the difference in the switching fields between selected and unselected bits. The combined effect of these two characteristics results in increased bit yield (relative to similarly sized symmetric bits) due to a smaller overlap between selected and unselected bit switching distributions. |
