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Title

Dynamics of laser-induced phase switching in GeTe films

AuthorsGawelda, W.; Siegel, Jan ; Afonso, Carmen N. ; Plausinaitiene, V.; Abrutis, A.; Wiemer, C.
Issue Date2011
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 109: 123102 (2011)
AbstractPhase switching in GeTe thin films (grown using a modified metal organic chemical vapor deposition system) upon pulsed femtosecond and nanosecond laser irradiation has been studied. Two in situ methods, i.e., optical microscopy and real-time reflectivity measurements, have been used in order to compare the optical response before and after phase change and to follow the phase change dynamics with a time resolution close to 400 ps. The results show that cycling is possible under irradiation with both fs and ns pulses using single pulses for amorphization and multiple pulses for crystallization. The use of ns pulses favors the crystalline-to-amorphous phase transformation, with a characteristic transformation time of ∼15 ns. The presence of the liquid phase was identified and temporally resolved, featuring a well-defined transient reflectivity state, in between those of the crystalline and amorphous phases. We have also studied the role of material configuration in the phase change dynamics and the mechanisms involved in the re-crystallization process. © 2011 American Institute of Physics.
URIhttp://hdl.handle.net/10261/59061
DOI10.1063/1.3596562
Identifiersdoi: 10.1063/1.3596562
issn: 0021-8979
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