Direct determination of large Spin-Torque nonadiabaticity in Vortex Core Dynamics

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2010
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Rhensius, Jan
Bisig, André
Joly, Loic
Nolting, Frithjof
Heyderman, Laura
Thiele, Jan- Ulrich
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Physical Review Letters. 2010, 105(18). ISSN 0031-9007. Available under: doi: 10.1103/PhysRevLett.105.187203
Zusammenfassung

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.

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ISO 690HEYNE, Lutz, Jan RHENSIUS, Dennis ILGAZ, André BISIG, Ulrich RÜDIGER, Mathias KLÄUI, Loic JOLY, Frithjof NOLTING, Laura HEYDERMAN, Jan- Ulrich THIELE, Florian KRONAST, 2010. Direct determination of large Spin-Torque nonadiabaticity in Vortex Core Dynamics. In: Physical Review Letters. 2010, 105(18). ISSN 0031-9007. Available under: doi: 10.1103/PhysRevLett.105.187203
BibTex
@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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