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Ultrafast x-ray diffraction study of melt-front dynamics in polycrystalline thin films

Assefa, TA; Cao, Y; Banerjee, S; Kim, S; Kim, D; Lee, H; Kim, S; ... Robinson, IK; + view all (2020) Ultrafast x-ray diffraction study of melt-front dynamics in polycrystalline thin films. Science Advances , 6 (3) , Article eaax2445. 10.1126/sciadv.aax2445. Green open access

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Abstract

Melting is a fundamental process of matter that is still not fully understood at the microscopic level. Here, we use time-resolved x-ray diffraction to examine the ultrafast melting of polycrystalline gold thin films using an optical laser pump followed by a delayed hard x-ray probe pulse. We observe the formation of an intermediate new diffraction peak, which we attribute to material trapped between the solid and melted states, that forms 50 ps after laser excitation and persists beyond 500 ps. The peak width grows rapidly for 50 ps and then narrows distinctly at longer time scales. We attribute this to a melting band originating from the grain boundaries and propagating into the grains. Our observation of this intermediate state has implications for the use of ultrafast lasers for ablation during pulsed laser deposition.

Type: Article
Title: Ultrafast x-ray diffraction study of melt-front dynamics in polycrystalline thin films
Open access status: An open access version is available from UCL Discovery
DOI: 10.1126/sciadv.aax2445
Publisher version: https://doi.org/10.1126/sciadv.aax2445
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10090753
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