Lee, Eun-Sung Yoo, Joung E. Yoon, Du S. Kim, Sung D. Kim, Yongjoo Hwang, Soobin Kim, Dasol Jeong, Hyeong-Chai Kim, Won T. Chang, Hye J. Suh, Hoyoung Ko, Dae-Hong Cho, Choonghee Choi, Yongjoon Kim, Do H. Cho, Mann-Ho 2024-01-19T17:01:04Z 2024-01-19T17:01:04Z 2021-09-02 2020-08-13 2045-2322 https://pubs.kist.re.kr/handle/201004/118259 Phase-change memory utilizing amorphous-to-crystalline phase-change processes for reset-to-set operation as a nonvolatile memory has been recently commercialized as a storage class memory. Unfortunately, designing new phase-change materials (PCMs) with low phase-change energy and sufficient thermal stability is difficult because phase-change energy and thermal stability decrease simultaneously as the amorphous phase destabilizes. This issue arising from the trade-off relationship between stability and energy consumption can be solved by reducing the entropic loss of phase-change energy as apparent in crystalline-to-crystalline phase-change process of a GeTe/Sb2Te3 superlattice structure. A paradigm shift in atomic crystallography has been recently produced using a quasi-crystal, which is a new type of atomic ordering symmetry without any linear translational symmetry. This paper introduces a novel class of PCMs based on a quasicrystalline-to-approximant crystalline phase-change process, whose phase-change energy and thermal stability are simultaneously enhanced compared to those of the GeTe/Sb2Te3 superlattice structure. This report includes a new concept that reduces entropic loss using a quasicrystalline state and takes the first step in the development of new PCMs with significantly low phase-change energy and considerably high thermal stability. English NATURE PUBLISHING GROUP THERMOELECTRIC PROPERTIES FILMS NUCLEI Quasicrystalline phase-change memory Article 10.1038/s41598-020-70662-2 1 SCIENTIFIC REPORTS, v.10, no.1 SCIENTIFIC REPORTS 10 1 scie scopus 000563546400005 2-s2.0-85089366632 Multidisciplinary Sciences Science & Technology - Other Topics Article THERMOELECTRIC PROPERTIES FILMS NUCLEI