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@ARTICLE{Sluka:280559,
      author       = {Sluka, V. and Kákay, A. and Deac, A. M. and Bürgler, D.
                      E. and Schneider, C. M. and Hertel, R.},
      title        = {{S}pin-torque-induced dynamics at fine-split frequencies in
                      nano-oscillators with two stacked vortices},
      journal      = {Nature Communications},
      volume       = {6},
      issn         = {2041-1723},
      address      = {London},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2016-00327},
      pages        = {6409 -},
      year         = {2015},
      abstract     = {The gyrotropic rotation around the equilibrium position
                      constitutes the fundamental excitation of magnetic vortices
                      in nanostructures. The frequency of this mode varies with
                      material and sample geometry, but is independent of the
                      vortex handedness and its core direction. Here, we
                      demonstrate that this degeneracy is lifted in a spin-torque
                      oscillator containing two vortices stacked on top of each
                      other. When driven by spin-polarized currents, such devices
                      exhibit a set of dynamic modes with discretely split
                      frequencies, each corresponding to a specific combination of
                      vorticities and relative core polarities. The fine splitting
                      occurs even in the absence of external fields, demonstrating
                      that such devices can function as zero-field, multi-channel,
                      nano-oscillators for communication technologies. It also
                      facilitates the detection of the relative core polarization
                      and allows for the eight non-degenerate configurations to be
                      distinguished electrically, which may enable the design of
                      multi-state memory devices based on double-vortex
                      nanopillars.},
      cin          = {PGI-6},
      ddc          = {500},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000353038800001},
      pubmed       = {pmid:25731900},
      doi          = {10.1038/ncomms7409},
      url          = {https://juser.fz-juelich.de/record/280559},
}