Time-Dependent Elastic Properties and Lattice Temperature of the Photoexcited Iron Oxide Nanocrystals
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Time-dependent elastic properties and lattice temperature of the photoexcited superparamagnetic iron oxide (Fe3O4) nanocrystals were investigated by pump/probe transient absorption measurements. Information on the elastic property and lattice temperature of the photoexcited nanocrystals was obtained from the period of coherent acoustic phonon. From the excitation fluence-dependent measurement of the coherent phonon period, initial temperature rise due to the photoexcitation was estimated. From the two-pump/probe transient absorption measurement, where the first pump heated the lattice and the time-delayed second pump generated coherent phonon, time dependence of the lattice temperature was also investigated. Implication of knowledge on the lattice heating and cooling on the study of the magnetization dynamics of the photoexcited magnetic nanocrystals was discussed. © 2008 American Chemical Society.
author list (cited authors)
Chen, T., Hsia, C., & Son, D. H.