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@ARTICLE{Sluka:17398,
      author       = {Sluka, V. and Kakay, A. and Deac, A. M. and Burgler, D. E.
                      and Hertel, R. and Schneider, C. M.},
      title        = {{S}pin-{T}ransfer {T}orque {I}nduced {V}ortex {D}ynamics in
                      {F}e/{A}g/{F}e {N}anopillars},
      journal      = {Journal of physics / D},
      volume       = {44},
      issn         = {0022-3727},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-17398},
      pages        = {384002},
      year         = {2011},
      note         = {A M D acknowledges financial support from the EU project
                      STraDy (MOIF-CT-2006-039772).},
      abstract     = {We report on the experimental and analytical work on
                      spin-transfer torque induced vortex dynamics in metallic
                      nanopillars with in-plane magnetized layers. We study
                      nanopillars with a diameter of 150 nm, containing two Fe
                      layers with a thickness of 15 nm and 30 nm, respectively,
                      separated by a 6 nm Ag spacer. The sample geometry is such
                      that it allows for the formation of magnetic vortices in the
                      Fe discs. As confirmed by micromagnetic simulations, we are
                      able to prepare states where one magnetic layer is
                      homogeneously magnetized while the other contains a vortex.
                      We experimentally show that in this configuration
                      spin-transfer torque can excite vortex dynamics and analyse
                      their dependence on a magnetic field applied in the sample
                      plane. The centre of gyration is continuously dislocated
                      from the disc centre, and the potential changes its shape
                      with field strength. The latter is reflected in the field
                      dependence of the excitation frequency. In the second part
                      we propose a novel mechanism for the excitation of the
                      gyrotropic mode in nanopillars with a perfectly
                      homogeneously magnetized in-plane polarizing layer. We
                      analytically show that in this configuration the vortex can
                      absorb energy from the spin-polarized electric current if
                      the angular spin-transfer efficiency function is asymmetric.
                      This effect is supported by micromagnetic simulations.},
      keywords     = {J (WoSType)},
      cin          = {PGI-6},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Physics, Applied},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000294772500003},
      doi          = {10.1088/0022-3727/44/38/384002},
      url          = {https://juser.fz-juelich.de/record/17398},
}