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@PHDTHESIS{Weides:58890,
      author       = {Weides, Martin},
      title        = {{J}osephson {T}unnel {J}unctions with {F}erromagnetic
                      {I}nterlayer},
      volume       = {13},
      school       = {Universität Köln},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-58890},
      isbn         = {978-3-89336-472-5},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Informationstechnik / Information Technology},
      pages        = {IX, 144 S.},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012; Universität Köln,
                      Diss., 2006},
      abstract     = {Superconductivity and ferromagnetism are well-known
                      physical properties of solid states that have been widely
                      studied and long thought about as antagonistic phenomena due
                      to difference in spin ordering. It turns out that the
                      combination of both superconductor and ferromagnet leads to
                      a very rich and interesting physics. One particular example,
                      the phase oscillations of the superconducting order
                      parameter inside the ferromagnet, will play a major role for
                      the devices discussed in this work. In this thesis, I
                      present Josephson junctions with a thin Al2O3 tunnel barrier
                      and a ferromagnetic interlayer, i.e.
                      superconductor-insulator-ferromagnet-superconductor (SIFS)
                      stacks. The fabrication of junctions was optimized regarding
                      the insulation of electrodes and the homogeneity of the
                      current transport. The junctions were either in the 0 or π
                      coupled ground state, depending on the thickness of the
                      ferromagnetic layer and on temperature. The influence of
                      ferromagnetic layer thickness on the transport properties
                      and the coupling (0, $\pi$) of SIFS tunnel junctions was
                      studied. Furthermore, using a stepped ferromagnetic layer
                      with well-chosen thicknesses, I obtained the so-called
                      0-$\pi$ Josephson junction. At a certain temperature this
                      0-$\pi$ junction can be made perfectly symmetric. In this
                      case the ground state corresponds to a vortex of
                      supercurrent creating a magnetic flux which is a fraction of
                      the magnetic flux quantum $\Phi_{0}$. Such structures allow
                      to study the physics of fractional vortices and to build
                      various electronic circuits based on them. The SIFS
                      junctions presented here have an exponentially vanishing
                      damping at T → 0. The SIFS technology developed within the
                      framework of this work may be used to construct classical
                      and quantum devices such as oscillators, memory cells and
                      qubits.},
      cin          = {IFF-6},
      ddc          = {620},
      cid          = {I:(DE-Juel1)VDB786},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/58890},
}