Academic Journal
Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials
| العنوان: | Femtosecond x-ray diffraction reveals a liquid–liquid phase transition in phase-change materials |
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| المؤلفون: | Zalden, P., Quirin, F., Schumacher, M., Siegel, Jan, Wei, S., Koc, A., Nicoul, M., Trigo, M., Andreasson, P., Enquist, H., Shu, M.J., Pardini, T., Chollet, M., Zhu, D., Lemke, H., Ronneberger, I., Larsson, J., Lindenberg, A.M., Fischer, H. E., Hau-Riege, S., Reis, D.A., Mazzarello, R., Wuttig, M., Sokolowski-Tinten, K. |
| المساهمون: | German Research Foundation, European Commission, RWTH Aachen University, Department of Energy (US), Swedish Research Council, Ministerio de Ciencia, Innovación y Universidades (España) |
| بيانات النشر: | American Association for the Advancement of Science |
| سنة النشر: | 2019 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| الوصف: | 6 pags., 5 figs. ; In phase-change memory devices, a material is cycled between glassy and crystalline states. The highly temperature-dependent kinetics of its crystallization process enables application in memory technology, but the transition has not been resolved on an atomic scale. Using femtosecond x-ray diffraction and ab initio computer simulations, we determined the time-dependent pair-correlation function of phase-change materials throughout the melt-quenching and crystallization process. We found a liquid–liquid phase transition in the phase-change materials AgInSbTe and GeSb at 660 and 610 kelvin, respectively. The transition is predominantly caused by the onset of Peierls distortions, the amplitude of which correlates with an increase of the apparent activation energy of diffusivity. This reveals a relationship between atomic structure and kinetics, enabling a systematic optimization of the memory-switching kinetics. ; F.Q., A.K., M.N., and K.S.T. gratefully acknowledge financial support from the German Research Council through the Collaborative Research Center SFB 1242 project 278162697 (“Non-Equilibrium Dynamics of Condensed Matter in the Time Domain”), project C01 (“Structural Dynamics in Impulsively Excited Nanostructures”), and individual grant So408/9-1, as well as the European Union (7th Framework Programme, grant no. 280555 GO FAST). M.J.S., R.M., and M.W. acknowledge financial support from the German Research Council through the Collaborative Research Center SFB 917 (“Nanoswitches”) and individual grant Ma-5339/2-1. M.J.S., I.R., and R.M. also acknowledge the computational resources granted by JARA-HPC from RWTH Aachen University under project nos. JARA0150 and JARA0183. M.T., A.M.L., and D.A.R. were supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, through the Division of Materials Sciences and Engineering under contract no. DE-AC02-76SF00515. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| تدمد: | 1095-9203 |
| Relation: | #PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/EC/FP7/280555; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/TEC2017-82464-R; http://dx.doi.org/10.1126/science.aaw1773; Sí; Science 364: 1062-1067 (2019); http://hdl.handle.net/10261/207018; http://dx.doi.org/10.13039/501100007210; http://dx.doi.org/10.13039/501100001659; http://dx.doi.org/10.13039/501100000780; http://dx.doi.org/10.13039/100000015 |
| DOI: | 10.1126/science.aaw1773 |
| DOI: | 10.13039/501100007210 |
| DOI: | 10.13039/501100001659 |
| DOI: | 10.13039/501100000780 |
| DOI: | 10.13039/100000015 |
| الاتاحة: | http://hdl.handle.net/10261/207018 https://doi.org/10.1126/science.aaw1773 https://doi.org/10.13039/501100007210 https://doi.org/10.13039/501100001659 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/100000015 |
| Rights: | open |
| رقم الانضمام: | edsbas.14A79C1F |
| قاعدة البيانات: | BASE |
| تدمد: | 10959203 |
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| DOI: | 10.1126/science.aaw1773 |