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Thermal conduction strongly influences the programming energy and speed in phase-change-memory devices. The thermal conductivity of the crystalline phase of can be strongly anisotropic due to phase impurities at grain boundaries. This letter models this effect using effective medium arguments, lends further support to the hypothesis that phase impurities are...
We report the thickness and phase dependent thermal properties of Ge2Sb2Te5 (GST) films using electrical Joule heating thermometry (3ω method) and validate the data with optical thermometry. The intrinsic thermal conductivity of GST increases from 0.26 W/mK for the amorphous phase to 0.57 W/mK for the crystalline phase. The thermal boundary resistance between GST and Si3N4 films decreases from 134...
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