Memory cells
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United States of America Patent
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Jul 19, 2016
Grant Date -
Dec 24, 2015
app pub date -
Aug 31, 2015
filing date -
Aug 30, 2006
priority date (Note) -
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Abstract
Memory cells useful in phase change memory include a phase change material between first and second electrode and having a surface facing a surface of the second electrode. The second electrode comprises a plurality of portions of material, each portion having a respective distance from the surface of the phase change material and each portion having a respective resistivity. A portion of the plurality of portions of material farthest from the surface of the phase change material has a lowest resistivity and a portion of the plurality of portions of material closest to the surface of the phase change material has a highest resistivity. The resistivity of each individual portion is lower than the resistivity of each portion located closer to the surface of the phase change material, and higher than the resistivity of each portion located farther from the surface of the phase change material.
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