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We study the proximity effect in superconductor (S), antiferromagnetic (AF)bilayers, and report the fabrication and measurement of the first trilayerS/AF/S Josephson junctions. The disordered f.c.c. alloy \gamma-Fe50Mn50 wasused as the AF, and the S is Nb. Micron and sub-micron scale junctions weremeasured, and the scaling of $J_C (d_AF)$ gives a coherence length in the AF of2.4 nm, which correlates with the coherence length due to suppression of $T_C$in the bilayer samples. The diffusion constant for FeMn was found to be 1.7\times 10$^{-4}$ m$^2$ s$^-1$, and the density of states at the Fermi level wasalso obtained. An exchange biased FeMn/Co bilayer confirms the AF nature of theFeMn in this thickness regime.Comment: 6 pages, 5 figures, accepted for Phys. Rev.

physical review. b, condensed matter

Proximity and Josephson effects in superconductor/antiferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Nb</mml:mi><mml:mo>/</mml:mo><mml:mi>γ</mml:mi><mml:mo>−</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>50</mml:mn></mml:mrow…

Proximity and Josephson effects in superconductor/antiferromagneticNb/γ−Fe50Mn50