Coupling phenomena in superconducting Nb/Fe multilayers
G. Verbanck, C. D. Potter, V. Metlushko, R. Schad, V. V. Moshchalkov, Y. Bruynseraede
DOI 10.1103/PhysRevB.57.6029 · Physical Review B
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Abstract
We measured the critical temperature Tc and critical field Hc2 of molecular-beam epitaxy-grown Nb/Fe multilayers in which the layer thicknesses tFe and tNb are systematically varied. For constant tNb we observe a continuous decrease of Tc with increasing tFe up to tFe=15Å. At higher tFe values a sudden drop of Tc is measured related to the onset of ferromagnetism in the Fe layers. Measurements of the shape and the angular dependence of Hc2(T) clearly show that the superconducting Nb layers are already decoupled for tFe=12Å, magnetization measurements, however show that the Fe layers are ferromagnetic only for tFe>~16Å. For constant tFe=25Å, the observed strong decrease of Tc with decreasing Nb thickness as well as the temperature dependence of Hc2 are well described by the theoretical model for decoupled superconductor/ferromagnet multilayers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb/Fe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | midpoint |
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