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Probing the Melting Transitions in Phase-Change Superlattices via Thin Film Nanocalorimetry

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Title
Probing the Melting Transitions in Phase-Change Superlattices via Thin Film Nanocalorimetry
Author(s)
Zhao, Jie; Khan, Asir Intisar; Efremov, Mikhail Y.; Ye, Zichao; Wu, Xiangjin; Kangsik Kim; Zonghoon Lee; Wong, H-S Philip; Pop, Eric; Allen, Leslie H.
Publication Date
2023-05
Journal
Nano Letters, v.23, no.10, pp.4587 - 4594
Publisher
American Chemical Society
Abstract
Phase-change superlattices with nanometer thin sublayers are promising for low-power phase-change memory (PCM) on rigid and flexible platforms. However, the thermodynamics of the phase transition in such nanoscale superlattices remain unexplored, especially at ultrafast scanning rates, which is crucial for our fundamental understanding of superlattice-based PCM. Here, we probe the phase transition of Sb2Te3 (ST)/Ge2Sb2Te5 (GST) superlattices using nanocalorimetry with a monolayer sensitivity (∼1 Å) and a fast scanning rate (105 K/s). For a 2/1.8 nm/nm Sb2Te3/GST superlattice, we observe an endothermic melting transition with an ∼240 °C decrease in temperature and an ∼8-fold decrease in enthalpy compared to those for the melting of GST, providing key thermodynamic insights into the low-power switching of superlattice-based PCM. Nanocalorimetry measurements for Sb2Te3 alone demonstrate an intrinsic premelting similar to the unique phase transition of superlattices, thus revealing a critical role of the Sb2Te3 sublayer within our superlattices. These results advance our understanding of superlattices for energy-efficient data storage and computing. © 2023 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/13434
DOI
10.1021/acs.nanolett.3c01049
ISSN
1530-6984
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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