%0 Journal Article
%A Weides, M.
%A Kemmler, M.
%A Kohlstedt, H.
%A Waser, R.
%A Koelle, D.
%A Kleiner, R.
%A Goldobin, E.
%T O-pi Josephson tunnel junctions with ferromagnetic barrier
%J Physical review letters
%V 97
%@ 0031-9007
%C College Park, Md.
%I APS
%M PreJuSER-54855
%P 247001
%D 2006
%Z Record converted from VDB: 12.11.2012
%X We fabricated high quality Nb/Al2O3/Ni0.6Cu0.4/Nb superconductor-insulator-ferromagnet-superconductor Josephson tunnel junctions. Using a ferromagnetic layer with a steplike thickness, we obtain a 0-pi junction, with equal lengths and critical currents of 0 and pi parts. The ground state of our 330 mu m (1.3 lambda(J)) long junction corresponds to a spontaneous vortex of supercurrent pinned at the 0-pi step and carrying similar to 6.7% of the magnetic flux quantum Phi(0). The dependence of the critical current on the applied magnetic field shows a clear minimum in the vicinity of zero field.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000242888700054
%R 10.1103/PhysRevLett.97.247001
%U https://juser.fz-juelich.de/record/54855