Current-induced vortex dynamics and pinning potentials probed by homodyne detection

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2010_PhysRevB_Current.pdf
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2010
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Kim, June-Seo
Boulle, Olivier
Verstoep, Steven
Rhensius, Jan
Heyderman, Laura Jane
Kronast, Florian
Mattheis, Roland
Ulysse, Christian
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Physical Review B. 2010, 82, 104427. Available under: doi: 10.1103/PhysRevB.82.104427
Zusammenfassung

Using a homodyne detection scheme, we show that we can determine the polarity and chirality of a magnetic vortex in an asymmetric magnetic disk as well as the resonance frequency and phase shift of the dynamic vortex gyration excited by a spin-polarized current. From systematic phase measurements, we deduce the relative contributions of the spin torque and the Oersted field, which is found to dominate the excitation. Local pinning sites in the disk lead to an increased resonance frequency and a reduced amplitude. This allows us to draw a map of the pinning sites and thus to characterize the full potential in the disk.

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ISO 690KIM, June-Seo, Olivier BOULLE, Steven VERSTOEP, Lutz HEYNE, Jan RHENSIUS, Mathias KLÄUI, Laura Jane HEYDERMAN, Florian KRONAST, Roland MATTHEIS, Christian ULYSSE, Giancarlo FAINI, 2010. Current-induced vortex dynamics and pinning potentials probed by homodyne detection. In: Physical Review B. 2010, 82, 104427. Available under: doi: 10.1103/PhysRevB.82.104427
BibTex
@article{Kim2010Curre-8971,
  year={2010},
  doi={10.1103/PhysRevB.82.104427},
  title={Current-induced vortex dynamics and pinning potentials probed by homodyne detection},
  volume={82},
  journal={Physical Review B},
  author={Kim, June-Seo and Boulle, Olivier and Verstoep, Steven and Heyne, Lutz and Rhensius, Jan and Kläui, Mathias and Heyderman, Laura Jane and Kronast, Florian and Mattheis, Roland and Ulysse, Christian and Faini, Giancarlo},
  note={Article Number: 104427}
}
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