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@PHDTHESIS{Bouaziz:865993,
      author       = {Bouaziz, Juba},
      title        = {{S}pin-orbitronics at the nanoscale: {F}rom analytical
                      models to real materials},
      volume       = {204},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2019-05254},
      isbn         = {978-3-95806-429-4},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {228 S.},
      year         = {2019},
      note         = {RWTH Aachen, Diss., 2019},
      abstract     = {This thesis provides a theoretical description of magnetic
                      nanostructures in inversion-asymmetric environments with
                      strong spin-orbit interaction (SOI). The theoretical
                      concepts introduced here can be applied in the field of
                      spin-orbitronics, which consists ofexploiting the SOI to
                      manipulate the electron spin without external magnetic
                      fields. The investigated systems display a plethora of
                      interesting phenomena ranging from chiral magnetic
                      interactions to gapped magnetic excitations. In practice, we
                      adopt two different approaches: First, a model-based one
                      relying on the Rashba Hamiltonian, which is employed to
                      demystify and understand magnetic and transport properties
                      of magnetic nanostructures embedded in a Rashba electron
                      gas. Second, we use a first-principles approach within the
                      framework of the Korringa-Kohn-Rostoker (KKR) Green function
                      method to investigate the ground state properties of
                      magnetic impurities in topologically insulating hosts. This
                      method is suitable to simulate nanostructures in real space.
                      Then, we employed our newly developed code based on
                      time-dependent density functional theory to compute the spin
                      excitation spectra of these magnetic nanostructures embedded
                      in topological insulators. Moreover, the KKR Green function
                      method was used to simulate the electronic structure and
                      ground state properties of large magnetic nanostructures,
                      namely magnetic Skyrmions. In the first part, the analytical
                      Rashba Green function and the scattering matrices modeling
                      the magnetic impurities in the s-wave approximation are
                      employed for the computation of the magnetic interaction
                      tensor which contains: isotropic exchange,
                      Dzyaloshinskii-Moriya (DM) and pseudo-dipolar interactions.
                      The competition between these interactions leads to a rich
                      phase diagram depending on the distance between the magnetic
                      impurities. Next, we consider an external perturbing
                      electric field and investigate the transport properties by
                      computing the residual resistivity tensor within linear
                      response theory. The contribution of SOI is explored. The
                      investigation of arbitrary orientations of the impurity
                      magnetic moment allowed a detailed analysis of contributions
                      from the anisotropic magnetoresistance and planar Hall
                      effect. Moreover, we calculate the impurity induced bound
                      currents in the Rashba electron gas, which are used to
                      compute the induced orbital magnetization. For a trimer of
                      impurities with a non-vanishing spin chirality (SC) a finite
                      orbital magnetization is observed when SOI is turned off.
                      Since it emerges from the SC, it was named chiral orbital
                      magnetization. [...]},
      cin          = {IAS-1 / PGI-1},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142)},
      pid          = {G:(DE-HGF)POF3-142},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/865993},
}