WEIDES, M.; KEMMLER, M.; GOLDOBIN, E.; KOELLE, D.; KLEINER, R.; KOHLSTEDT, H.; BUZDIN, Alexandre I.

doi:10.1063/1.2356104

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WEIDES, M.
Center of Nanoelectronic Systems for Information Technology [CNI]

KEMMLER, M.
Physikalisches Institut II-Experimentalphysik II

GOLDOBIN, E.
Physikalisches Institut II-Experimentalphysik II

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Applied Physics Letters. 2006, vol. 89, p. 122511 (1-3)

American Institute of Physics

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We fabricated high quality $\Nb/\Al_2\O_3/\Ni_{0.6}\Cu_{0.4}/\Nb$ superconductor-insulator-ferromagnet-superconductor Josephson tunnel junctions. Depending on the thickness of the ferromagnetic $\Ni_{0.6}\Cu_{0.4}$ layer and on the ambient temperature, the junctions were in the 0 or $\pi$ ground state. All junctions have homogeneous interfaces showing almost perfect Fraunhofer patterns. The $\Al_2\O_3$ tunnel barrier allows to achieve rather low damping, which is desired for many experiments especially in the quantum domain. The McCumber parameter $\beta_c$ increases exponentially with decreasing temperature and reaches $\beta_c\approx700$ at $T=2.1 {\rm K}$. The critical current density in the $\pi$ state was up to $5\:\rm{A/cm^2}$ at $T=2.1 {\rm K}$, resulting in a Josephson penetration depth $\lambda_J$ as low as $160\:\rm{\mu m}$. Experimentally determined junction parameters are well described by theory taking into account spin-flip scattering in the $\Ni_{0.6}\Cu_{0.4}$ layer and different transparencies of the interfaces.< Réduire

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High quality ferromagnetic 0 and pi Josephson tunnel junctions

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