Ultrafast Photoresponse of Superconductor/Ferromagnet Nano-Layered Hybrids

Author

Pepe, Giovanni Piero ; Pan, D. ; Pagliarulo, V. ; Parlato, L. ; Marrocco, N. ; de Lisio, C. ; Peluso, G. ; Barone, A. ; Di Uccio, U. Scotti ; Casaburi, A. ; Tafuri, F. ; Khafizov, M. ; Taneda, T. ; Sobolewski, Roman

Author_Institution

Dept. of Phys. Sci., Univ. of Naples Federico II, Naples, Italy

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

376

Lastpage

381

Abstract

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.

Keywords

Cooper pairs; barium compounds; copper alloys; electron-phonon interactions; ferromagnetic materials; gold; high-speed optical techniques; high-temperature superconductors; lanthanum compounds; magnetic thin films; metallic thin films; nanostructured materials; nanotechnology; nickel alloys; niobium; niobium compounds; penetration depth (superconductivity); quasiparticles; sputter deposition; strontium compounds; superconducting photodetectors; superconducting thin films; superconducting transition temperature; time resolved spectra; yttrium compounds; Nb-NiCu; NbN-NiCu; YBaCuO-Au-NiCu; YBaCuO-LaSrMnO; carrier dynamics; correlated systems; electron-phonon scattering; femtosecond pump-probe spectroscopy measurements; ferromagnetic alloy; heterogeneous nanolayers; magnetron sputtering; nonequilibrium physics; optical radiation; photodetector applications; quasiparticle dynamics; spintronics device applications; superconducting penetration depth; superconducting transition temperature; superconductor-ferromagnet nanolayered hybrids; time-resolved spectra; ultrafast Cooper-pair; ultrafast photodetection; ultrathin films; Femtosecond pump-probe spectroscopy; nonequilibrium superconductivity; superconducting radiation detectors; superconducting thin films; superconductor-ferromagnet bilayers;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2018251

Filename

5153169