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Ultrafast Photoresponse of Superconductor/Ferromagnet Nano-Layered Hybrids

2009; IEEE Council on Superconductivity; Volume: 19; Issue: 3 Linguagem: Inglês

10.1109/tasc.2009.2018251

1558-2515

Giovanni Piero Pepe, Dong Pan, Vito Pagliarulo, L. Parlato, N. Marrocco, C. de Lisio, G. Peluso, A. Barone, U. Scotti di Uccio, A. Casaburi, F. Tafuri, Marat Khafizov, T. Taneda, Roman Sobolewski,

Superconductivity in MgB2 and Alloys

Interactions of superconducting nanostructures with external optical radiation represent a very interesting topic in both the framework of nonequilibrium physics and photodetector applications. Heterogeneous nano-layers, such as proximized superconductor/normal metal and superconductor/ferromagnet (S/F) bilayers, are very promising since they exhibit the ultrafast Cooper-pair and quasiparticle dynamics. We have characterized Nb/NiCu, NbN/NiCu, YBaCuO/Au/NiCu, and YBaCuO/LaSrMnO proximized S/F nano-bilayers, using time-resolved, all-optical, femtosecond pump-probe spectroscopy measurements down to 4 K. Our experiments demonstrate that these bilayers are very promising for novel, ultrafast photodetection and spintronics device applications. Moreover, our time-resolved studies of the carrier dynamics in oxide-based S/F structures open the way to novel basic-physics investigations of nonequilibrium effects in correlated systems.