@article{Heyne2010Direc-19845,
  year={2010},
  doi={10.1103/PhysRevLett.105.187203},
  title={Direct determination of large Spin-Torque nonadiabaticity in Vortex Core Dynamics},
  number={18},
  volume={105},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Heyne, Lutz and Rhensius, Jan and Ilgaz, Dennis and Bisig, André and Rüdiger, Ulrich and Kläui, Mathias and Joly, Loic and Nolting, Frithjof and Heyderman, Laura and Thiele, Jan- Ulrich and Kronast, Florian}
}

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    <dcterms:title>Direct determination of large Spin-Torque nonadiabaticity in Vortex Core Dynamics</dcterms:title>
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    <dc:contributor>Rüdiger, Ulrich</dc:contributor>
    <dc:creator>Heyne, Lutz</dc:creator>
    <dc:creator>Kronast, Florian</dc:creator>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2012-07-24T08:29:15Z</dc:date>
    <dc:creator>Heyderman, Laura</dc:creator>
    <dc:contributor>Thiele, Jan- Ulrich</dc:contributor>
    <dc:creator>Ilgaz, Dennis</dc:creator>
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    <dc:contributor>Nolting, Frithjof</dc:contributor>
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    <dc:contributor>Joly, Loic</dc:contributor>
    <dcterms:issued>2010</dcterms:issued>
    <dcterms:bibliographicCitation>First publ. in: Physical Review Letters ; 105 (2010), 18. - 187203</dcterms:bibliographicCitation>
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    <dcterms:abstract xml:lang="eng">We use a pump-probe photoemission electron microscopy technique to image the displacement of vortex cores in Permalloy discs due to the spin-torque effect during current pulse injection. Exploiting the distinctly different symmetries of the spin torques and the Oersted-field torque with respect to the vortex spin structure we determine the torques unambiguously, and we quantify the amplitude of the strongly debated nonadiabatic spin torque. The nonadiabaticity parameter is found to be β=0.15±0.07, which is more than an order of magnitude larger than the damping constant α, pointing to strong nonadiabatic transport across the high magnetization gradient vortex spin structures.</dcterms:abstract>
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