Layered ferromagnet/superconductor heterostructures: Nonequilibrium quasiparticle dynamics and photodetector applications
D. Pan, G. P. Pepe, V. Pagliarulo, C. De Lisio, L. Parlato, M. Khafizov, I. Komissarov, Roman Sobolewski
DOI 10.1103/PhysRevB.78.174503 · Physical Review B
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Abstract
Time-resolved optical pump-probe and photoimpedance studies of proximized ferromagnet/superconductor nanobilayers are presented. The weak ferromagnetic nature of an ultrathin Ni0.48Cu0.52 film makes it possible to observe the dynamics of the nonequilibrium superconductivity in NiCu∕Nb hybrids through time-resolved measurements of a near-surface optical reflectivity change, which is generated by femtosecond optical pump pulses and discussed within a nonequilibrium two-temperature electron-heating model. We observed that the NiCu overlay significantly reduced the slow bolometric contribution present in the photoresponse of a pure Nb film, resulting in a strong enhancement of the nonequilibrium kinetic-inductive component of the transient photoimpedance, measured as an ∼700−ps-wide voltage waveform generated across an optically excited current-biased NiCu∕Nb bilayer microbridge. The sensitive picosecond photoresponse makes our NiCu∕Nb heterostructures suitable for “engineered” ultrafast superconducting photodetectors since the photoimpedance signals observed in plain Nb bridges were at least 10ns long and were due to the light-induced simple-heating effect.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure not reported | unknown |
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