Proximity and Josephson effects in superconductor/antiferromagnetic Nb/γ−Fe50Mn50 heterostructures
C. Bell, E. J. Tarte, G. Burnell, C. W. Leung, D.-J. Kang, M. G. Blamire
DOI 10.1103/PhysRevB.68.144517 · Physical Review B
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Abstract
We study the proximity effect in superconductor (S), antiferromagnetic (AF) bilayers, and report the fabrication and measurement of the first trilayer S/AF/S Josephson junctions. The disordered fcc alloy γ−Fe50Mn50 was used as the AF, and the S is Nb. Micron and submicron scale junctions were measured, and the scaling of JC(dAF) gives a coherence length in the AF of 2.4 nm, which correlates with the coherence length due to suppression of TC in the bilayer samples. The diffusion constant for FeMn was found to be 1.7×10−4m2s−1, and the density of states at the Fermi level was also obtained. An exchange biased FeMn/Co bilayer confirms the AF nature of the FeMn in this thickness regime.
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. | 4.2 | Pressure not reported | midpoint |
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