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  • Title: Determination of sub-ps lattice dynamics in FeRh thin films.
    Author: Grimes M, Ueda H, Ozerov D, Pressacco F, Parchenko S, Apseros A, Scholz M, Kubota Y, Togashi T, Tanaka Y, Heyderman L, Thomson T, Scagnoli V.
    Journal: Sci Rep; 2022 May 20; 12(1):8584. PubMed ID: 35595862.
    Abstract:
    Understanding the ultrashort time scale structural dynamics of the FeRh metamagnetic phase transition is a key element in developing a complete explanation of the mechanism driving the evolution from an antiferromagnetic to ferromagnetic state. Using an X-ray free electron laser we determine, with sub-ps time resolution, the time evolution of the (-101) lattice diffraction peak following excitation using a 35 fs laser pulse. The dynamics at higher laser fluence indicates the existence of a transient lattice state distinct from the high temperature ferromagnetic phase. By extracting the lattice temperature and comparing it with values obtained in a quasi-static diffraction measurement, we estimate the electron-phonon coupling in FeRh thin films as a function of laser excitation fluence. A model is presented which demonstrates that the transient state is paramagnetic and can be reached by a subset of the phonon bands. A complete description of the FeRh structural dynamics requires consideration of coupling strength variation across the phonon frequencies.
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