Femtosecond laser pulse induced phase transition of Cr-doped Sb2Te1 films studied with a pump-probe system

Minghui Jiang; Qing Wang; Kai Lei; Yang Wang; Bo Liu; Zhitang Song

doi:10.1117/12.2249274

12 October 2016 Femtosecond laser pulse induced phase transition of Cr-doped Sb₂Te₁ films studied with a pump-probe system

Minghui Jiang, Qing Wang, Kai Lei, Yang Wang, Bo Liu, Zhitang Song

Author Affiliations +

Proceedings Volume 9818, 2016 International Workshop on Information Data Storage and Tenth International Symposium on Optical Storage; 981815 (2016) https://doi.org/10.1117/12.2249274
Event: 2016 International Workshop on Information Data Storage and Tenth International Symposium on Optical Storage, 2016, Changzhou, China

Abstract

The Femtosecond laser pulse induced phase transition dynamics of Cr-doped Sb₂Te₁ films was studied by real-time reflectivity measurements with a pump-probe system. It was found that crystallization of the as-deposited Cr_xSb₂Te₁ phase-change thin films exhibits a multi-stage process lasting for about 40ns.The time required for the multi-stage process seems to be not related to the contents of Cr element. The durations of the crystallization and amorphization processes are approximately the same. Doping Cr into Sb₂Te₁ thin film can improve its photo-thermal stability without obvious change in the crystallization rate. Optical images and image intensity cross sections are used to visualize the transformed regions. This work may provide further insight into the phase-change mechanism of Cr_xSb₂Te₁ under extra-non-equilibrium conditions and aid to develop new ultrafast phase-change memory materials.

Citation Download Citation

Minghui Jiang, Qing Wang, Kai Lei, Yang Wang, Bo Liu, and Zhitang Song "Femtosecond laser pulse induced phase transition of Cr-doped Sb₂Te₁ films studied with a pump-probe system", Proc. SPIE 9818, 2016 International Workshop on Information Data Storage and Tenth International Symposium on Optical Storage, 981815 (12 October 2016); https://doi.org/10.1117/12.2249274

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