Nonadiabatic Spin Torque Investigated Using Thermally Activated Magnetic Domain Wall Dynamics

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2010
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Eltschka, Matthias
Rhensius, Jan
Kasama, Takeshi
Dunin-Borkowski, Rafal E.
Heyderman, Laura J.
Driel, Hedwig J. van
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Using transmission electron microscopy, we investigate the thermally activated motion of domain walls (DWs) between two positions in Permalloy (Ni80Fe20) nanowires at room temperature. We show that this purely thermal motion is well described by an Arrhenius law, allowing for a description of the DW as a quasiparticle in a one-dimensional potential landscape. By injecting small currents, the potential is modified, allowing for the determination of the nonadiabatic spin torque: ßt=0.010±0.004 for a transverse DW and ßv=0.073±0.026 for a vortex DW. The larger value is attributed to the higher magnetization gradients present.

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ISO 690ELTSCHKA, Matthias, Mathias WÖTZEL, Jan RHENSIUS, Stephen KRZYK, Ulrich NOWAK, Mathias KLÄUI, Takeshi KASAMA, Rafal E. DUNIN-BORKOWSKI, Laura J. HEYDERMAN, Hedwig J. van DRIEL, Rembert A. DUINE, 2010. Nonadiabatic Spin Torque Investigated Using Thermally Activated Magnetic Domain Wall Dynamics. In: Physical Review Letters. 2010, 105(5), 056601. Available under: doi: 10.1103/PhysRevLett.105.056601
BibTex
@article{Eltschka2010Nonad-1005,
  year={2010},
  doi={10.1103/PhysRevLett.105.056601},
  title={Nonadiabatic Spin Torque Investigated Using Thermally Activated Magnetic Domain Wall Dynamics},
  number={5},
  volume={105},
  journal={Physical Review Letters},
  author={Eltschka, Matthias and Wötzel, Mathias and Rhensius, Jan and Krzyk, Stephen and Nowak, Ulrich and Kläui, Mathias and Kasama, Takeshi and Dunin-Borkowski, Rafal E. and Heyderman, Laura J. and Driel, Hedwig J. van and Duine, Rembert A.},
  note={Article Number: 056601}
}
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