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- W4387041519 abstract "Abstract The reversible phase transitions in phase-change memory devices can switch on the order of nanoseconds, suggesting a close structural resemblance between the amorphous and crystalline phases. In contrast, the amorphous structure is generally assumed to consist of a highly random ordering of atoms, quite distant to its crystalline counterpart. This work uses in-situ high-temperature x-ray absorption spectroscopy (XAS) and theoretical calculations to quantify the amorphous structure of bulk and nanoscale GeTe. Based on XAS experiments, we develop a theoretical model of the amorphous GeTe structure, consisting of a disordered fcc -type Te sublattice and randomly arranged chains of Ge atoms in a tetrahedral coordination. Strikingly, our intuitive and scalable model provides an accurate description of the structural dynamics in phase-change memory materials, observed experimentally. Specifically, we present a detailed crystallization mechanism through the formation of an intermediate, partially stable, ‘ideal glass’ state and demonstrate differences between bulk and nanoscale GeTe leading to size-dependent crystallization temperature." @default.
- W4387041519 created "2023-09-27" @default.
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- W4387041519 date "2023-09-26" @default.
- W4387041519 modified "2023-09-27" @default.
- W4387041519 title "Unravelling the Amorphous Structure, Nanoscale Effects, and Crystallization Mechanism of GeTe Phase Change Memory Material" @default.
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- W4387041519 doi "https://doi.org/10.21203/rs.3.rs-3382076/v1" @default.
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