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The temperature dependence of the relaxation dynamics in the bilayer thinfilm heterostructure composed of multiferroic BiFeO$_{3}$ (BFO) andsuperconducting YBa$_{2}$Cu$_{3}$O$_{7}$ (YBCO) grown on a (001) SrTiO$_{3}$substrate is studied by a time-resolved pump-probe technique, and compared withthat of pure YBCO thin film grown under the same growth conditions. Thesuperconductivity of YBCO is found to be retained in the heterostructure. Weobserve a speeding up of the YBCO recombination dynamics in the superconductingstate of the heterostructure, and attribute it to the presence of weakferromagnetism at the BFO/YBCO interface as observed in magnetization data. Anextension of the Rothwarf-Taylor model is used to fit the ultrafast dynamics ofBFO/YBCO, that models an increased quasiparticle occupation of theferromagnetic interfacial layer in the superconducting state of YBCO.

Interfacial effects revealed by ultrafast relaxation dynamics in BiFeO$_{3}$/YBa$_{2}$Cu$_{3}$O$_{7}$ bilayers