Nonmonotonic behavior of the anisotropy coefficient in superconductor-ferromagnet-superconductor trilayers
C. Cirillo, C. Bell, G. Iannone, S. L. Prischepa, J. Aarts, C. Attanasio
DOI 10.1103/PhysRevB.80.094510 · Physical Review B
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Abstract
We have measured critical temperatures and upper critical magnetic fields as a function of the ferromagnetic layer thickness, dF, in two different superconductor(S)/ferromagnet(F)/superconductor(S) triple layers: Nb/Cu0.41Ni0.59/Nb and Nb/Pd0.81Ni0.19/Nb. We vary dF from the 0-phase coupling to the π-phase coupling regime and find strong nonmonotonic behavior of the anisotropy coefficient γGL=Hc2∥(0)/Hc2⊥(0) characterized by an initial increase, a peak, and a subsequent decrease. The peak is a manifestation of the small coupling which exists around the 0−π transition and it is qualitatively in agreement with recent theoretical predictions [B. Krunavakarn and S. Yoksan, Physica C 440, 25 (2006)] which includes the effect of the different interface transparencies of the two systems. The experimental results demonstrate that the occurrence of the π phase strongly influences the transport properties of S/F/S systems in external fields.
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. | 8.3 | Pressure not reported | midpoint |
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