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Uncovering β-relaxations in amorphous phase-change materials

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Uncovering β-relaxations in amorphous phase-change materials. / Peng, Si Xu; Cheng, Yudong; Pries, Julian; Wei, Shuai; Yu, Hai Bin; Wuttig, Matthias.

In: Science Advances, Vol. 6, No. 2, eaay6726, 01.2020.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

Peng, SX, Cheng, Y, Pries, J, Wei, S, Yu, HB & Wuttig, M 2020, 'Uncovering β-relaxations in amorphous phase-change materials', Science Advances, vol. 6, no. 2, eaay6726. https://doi.org/10.1126/sciadv.aay6726

APA

Peng, S. X., Cheng, Y., Pries, J., Wei, S., Yu, H. B., & Wuttig, M. (2020). Uncovering β-relaxations in amorphous phase-change materials. Science Advances, 6(2), [eaay6726]. https://doi.org/10.1126/sciadv.aay6726

CBE

Peng SX, Cheng Y, Pries J, Wei S, Yu HB, Wuttig M. 2020. Uncovering β-relaxations in amorphous phase-change materials. Science Advances. 6(2):Article eaay6726. https://doi.org/10.1126/sciadv.aay6726

MLA

Vancouver

Peng SX, Cheng Y, Pries J, Wei S, Yu HB, Wuttig M. Uncovering β-relaxations in amorphous phase-change materials. Science Advances. 2020 Jan;6(2). eaay6726. https://doi.org/10.1126/sciadv.aay6726

Author

Peng, Si Xu ; Cheng, Yudong ; Pries, Julian ; Wei, Shuai ; Yu, Hai Bin ; Wuttig, Matthias. / Uncovering β-relaxations in amorphous phase-change materials. In: Science Advances. 2020 ; Vol. 6, No. 2.

Bibtex

@article{67be0d3044bc4b56a936c6c95ed4847f,
title = "Uncovering β-relaxations in amorphous phase-change materials",
abstract = "Relaxation processes are decisive for many physical properties of amorphous materials. For amorphous phase-change materials (PCMs) used in nonvolatile memories, relaxation processes are, however, difficult to characterize because of the lack of bulk samples. Here, instead of bulk samples, we use powder mechanical spectroscopy for powder samples to detect the prominent excess wings—a characteristic feature of β-relaxations—in a series of amorphous PCMs at temperatures below glass transitions. By contrast, β-relaxations are vanishingly small in amorphous chalcogenides of similar composition, which lack the characteristic features of PCMs. This conclusion is corroborated upon crossing the border from PCMs to non-PCMs, where β-relaxations drop substantially. Such a distinction implies that amorphous PCMs belong to a special kind of covalent glasses whose locally fast atomic motions are preserved even below the glass transitions. These findings suggest a correlation between β-relaxation and crystallization kinetics of PCMs, which have technological implications for phase-change memory functionalities.",
author = "Peng, {Si Xu} and Yudong Cheng and Julian Pries and Shuai Wei and Yu, {Hai Bin} and Matthias Wuttig",
year = "2020",
month = jan,
doi = "10.1126/sciadv.aay6726",
language = "English",
volume = "6",
journal = "Science Advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science",
number = "2",

}

RIS

TY - JOUR

T1 - Uncovering β-relaxations in amorphous phase-change materials

AU - Peng, Si Xu

AU - Cheng, Yudong

AU - Pries, Julian

AU - Wei, Shuai

AU - Yu, Hai Bin

AU - Wuttig, Matthias

PY - 2020/1

Y1 - 2020/1

N2 - Relaxation processes are decisive for many physical properties of amorphous materials. For amorphous phase-change materials (PCMs) used in nonvolatile memories, relaxation processes are, however, difficult to characterize because of the lack of bulk samples. Here, instead of bulk samples, we use powder mechanical spectroscopy for powder samples to detect the prominent excess wings—a characteristic feature of β-relaxations—in a series of amorphous PCMs at temperatures below glass transitions. By contrast, β-relaxations are vanishingly small in amorphous chalcogenides of similar composition, which lack the characteristic features of PCMs. This conclusion is corroborated upon crossing the border from PCMs to non-PCMs, where β-relaxations drop substantially. Such a distinction implies that amorphous PCMs belong to a special kind of covalent glasses whose locally fast atomic motions are preserved even below the glass transitions. These findings suggest a correlation between β-relaxation and crystallization kinetics of PCMs, which have technological implications for phase-change memory functionalities.

AB - Relaxation processes are decisive for many physical properties of amorphous materials. For amorphous phase-change materials (PCMs) used in nonvolatile memories, relaxation processes are, however, difficult to characterize because of the lack of bulk samples. Here, instead of bulk samples, we use powder mechanical spectroscopy for powder samples to detect the prominent excess wings—a characteristic feature of β-relaxations—in a series of amorphous PCMs at temperatures below glass transitions. By contrast, β-relaxations are vanishingly small in amorphous chalcogenides of similar composition, which lack the characteristic features of PCMs. This conclusion is corroborated upon crossing the border from PCMs to non-PCMs, where β-relaxations drop substantially. Such a distinction implies that amorphous PCMs belong to a special kind of covalent glasses whose locally fast atomic motions are preserved even below the glass transitions. These findings suggest a correlation between β-relaxation and crystallization kinetics of PCMs, which have technological implications for phase-change memory functionalities.

UR - http://www.scopus.com/inward/record.url?scp=85077941752&partnerID=8YFLogxK

U2 - 10.1126/sciadv.aay6726

DO - 10.1126/sciadv.aay6726

M3 - Journal article

C2 - 31950085

AN - SCOPUS:85077941752

VL - 6

JO - Science Advances

JF - Science Advances

SN - 2375-2548

IS - 2

M1 - eaay6726

ER -