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@PHDTHESIS{Brinker:891866,
      author       = {Brinker, Sascha},
      title        = {{C}omplex magnetism of nanostructures on surfaces: from
                      orbital magnetism to spin excitations},
      volume       = {228},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2021-01786},
      isbn         = {978-3-95806-525-3},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {III, 208 S.},
      year         = {2021},
      note         = {RWTH Aachen, Diss., 2020},
      abstract     = {Magnetic nanostructures on surfaces are promising building
                      blocks of future spintronics devices, as they represent the
                      ultimate limit in miniaturization. In this thesis, a
                      combination of density functional theory and model-based
                      studies is used to investigate magnetic nanostructures on
                      surfaces with respect to fundamental theoretical properties
                      and in relation to scanning tunneling microscopy
                      experiments. Novel properties are unveiled in this class of
                      systems by several methodological developments, from a new
                      perspective on the orbital magnetism to the static and
                      dynamic properties of complex non-collinear magnetic states.
                      Firstly, we shed light on the orbital magnetic moment in
                      magnetic nanostructures on surfacesand find a new component
                      – the inter-atomic orbital moment. A systematic analysis
                      uncoversits distinct physical origin, its non-negligible
                      strength, and its particular long range in realistic systems
                      like adatoms deposited on the Pt(111) surface. Our results
                      show unambiguously theimportance and the potential of this
                      new contribution to the orbital magnetism.Secondly, we
                      investigate magnetic exchange interactions in magnetic
                      nanostructures goingbeyond the common bilinear exchange
                      interactions. Special focus is given to higher-order
                      interactions whose microscopic origin is clarified using a
                      model-based study. Using the prototypical test systems of
                      magnetic dimers we find a new chiral pair interaction, the
                      chiral biquadratic interaction, which is the biquadratic
                      equivalent to the well-known Dzyaloshinskii-Moriya
                      interaction, and investigate its properties and its
                      implications not only for finite nanostructures but also for
                      extended systems. Thirdly, we focus on the spin dynamics and
                      the damping in non-collinear magnetic structures by
                      investigating the dependencies of the Gilbert damping tensor
                      on the non-collinearity in an atomistic form using a
                      combination of a model-based study and first-principles
                      calculations. We show how isotropic and chiral dependencies
                      evolve from an Anderson-like model and inrealistic systems
                      like magnetic dimers on the Au(111) surface. These results
                      have the potential to drive the field of atomistic spin
                      dynamics to a more sophisticated description of the damping
                      mechanisms. Fourthly, we investigate the magnetic stability
                      of nanostructures, which is one of the key ingredients on
                      the road towards future data storage devices. The impact of
                      magnetic exchange interactions between nanostructures on the
                      magnetic stability as probed in telegraph noise scanning
                      tunneling microscopy experiments is analyzed by using the
                      example of a magnetic trimer and a magnetic adatom. We find
                      three regimes each driven by a distinct magnetic exchange
                      interaction and show how this knowledge can be used to
                      engineer the magnetic stability. Lastly, we analyze the
                      complex interplay of magnetism, spin-orbit coupling and
                      superconductivity in magnetic chains on a superconducting
                      substrate with a special focus on the emergence of boundary
                      states. We shed light on the puzzling magnetic ground state
                      of Fe chains on theRe(0001) substrate and show how boundary
                      effects can be minimized by termination with non-magnetic Co
                      chains. Our results provide vital clues on the nature of the
                      boundary states found in Fe chains on Re(0001), and support
                      their identification as Majorana states.},
      cin          = {PGI-1 / IAS-1 / JARA-FIT / JARA-HPC},
      cid          = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)IAS-1-20090406 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {521 - Quantum Materials (POF4-521)},
      pid          = {G:(DE-HGF)POF4-521},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/891866},
}