Physics – Condensed Matter – Superconductivity
Scientific paper
2006-04-04
Appl. Phys. Lett. 89, 122511 (2006)
Physics
Condensed Matter
Superconductivity
Changed content and Corrected typos
Scientific paper
10.1063/1.2356104
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.
Buzdin Alexandre
Goldobin Edward
Kemmler Matthias
Kleiner Reinhold
Koelle Dieter
No associations
LandOfFree
High quality ferromagnetic 0 and pi Josephson tunnel junctions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High quality ferromagnetic 0 and pi Josephson tunnel junctions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High quality ferromagnetic 0 and pi Josephson tunnel junctions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-501735