Publikation:

Relationship between Nonadiabaticity and Damping in Permalloy Studied by Current Induced Spin Structure Transformations

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PRL100_066603_2008.pdf
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2008

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Backes, Daniel
Moore, T. A.
Heyderman, Laura J.
Fraile Rodríguez, Arantxa
Nolting, Frithjof
Mentes, Tevfik Onur
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http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-54910
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https://doi.org/10.1103/PhysRevLett.100.066603
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Published

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Physical Review Letters. 2008, 100, 66603. Available under: doi: 10.1103/PhysRevLett.100.066603

Zusammenfassung

By direct imaging we determine spin structure changes in Permalloy wires and disks due to spin transfer torque as well as the critical current densities for different domain wall types. Periodic domain wall transformations from transverse to vortex walls and vice versa are observed, and the transformation mechanism occurs by vortex core displacement perpendicular to the wire. The results imply that the nonadiabaticity parameter beta does not equal the damping alpha, in agreement with recent theoretical predictions. The vortex core motion perpendicular to the current is further studied in disks revealing that the displacement in opposite directions can be attributed to different polarities of the vortex core.

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ISO 690HEYNE, Lutz, Mathias KLÄUI, Daniel BACKES, T. A. MOORE, Stephen KRZYK, Ulrich RÜDIGER, Laura J. HEYDERMAN, Arantxa FRAILE RODRÍGUEZ, Frithjof NOLTING, Tevfik Onur MENTES, Miguel Ángel NIÑO, Andrea LOCATELLI, Konstantin KIRSCH, Roland MATTHEIS, 2008. Relationship between Nonadiabaticity and Damping in Permalloy Studied by Current Induced Spin Structure Transformations. In: Physical Review Letters. 2008, 100, 66603. Available under: doi: 10.1103/PhysRevLett.100.066603
BibTex
@article{Heyne2008Relat-9476,
  year={2008},
  doi={10.1103/PhysRevLett.100.066603},
  title={Relationship between Nonadiabaticity and Damping in Permalloy Studied by Current Induced Spin Structure Transformations},
  volume={100},
  journal={Physical Review Letters},
  author={Heyne, Lutz and Kläui, Mathias and Backes, Daniel and Moore, T. A. and Krzyk, Stephen and Rüdiger, Ulrich and Heyderman, Laura J. and Fraile Rodríguez, Arantxa and Nolting, Frithjof and Mentes, Tevfik Onur and Niño, Miguel Ángel and Locatelli, Andrea and Kirsch, Konstantin and Mattheis, Roland},
  note={Article Number: 66603}
}
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