%0 Journal Article
%A Weides, M.
%A Kohlstedt, H.
%A Waser, R.
%A Kemmler, M.
%A Pfeiffer, J.
%A Koelle, D.
%A Kleiner, R.
%A Goldobin, E.
%T Ferromagnetic o-pi Josephson junctions
%J Applied physics / A
%V 89
%@ 0947-8396
%C Berlin
%I Springer
%M PreJuSER-58463
%P 613
%D 2007
%Z Record converted from VDB: 12.11.2012
%X We present a study on low-T-c superconductor-insulator-ferromagnet-superconductor (SIFS) Josephson junctions. SIFS junctions have gained considerable interest in recent years because they show a number of interesting properties for future classical and quantum computing devices. We optimized the fabrication process of these junctions to achieve a homogeneous current transport, ending up with high-quality samples. Depending on the thickness of the ferromagnetic layer and on temperature, the SIFS junctions are in the ground state with a phase drop of either 0 or pi. By using a ferromagnetic layer with variable step-like thickness along the junction, we obtained a so-called 0-pi Josephson junction, in which 0 and pi ground states compete with each other. At a certain temperature the 0 and pi parts of the junction are perfectly symmetric, i.e. the absolute critical current densities are equal. In this case the degenerate ground state corresponds to a vortex of supercurrent circulating clock- or counterclockwise and creating a magnetic flux which carries a fraction of the magnetic flux quantum phi(0).
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000249663500007
%R 10.2007/s00339-007-4206-3
%U https://juser.fz-juelich.de/record/58463