Non-adiabatic spin torque investigated using thermally activated magnetic domain wall dynamics

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...

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Bibliographic Details
Published in:arXiv.org 2010-05
Main Authors: Eltschka, M, Wötzel, M, Rhensius, J, Krzyk, S, Nowak, U, M Kläui T Kasama, Dunin-Borkowski, R E, Heyderman, L J, van Driel, H J, Duine, R A
Format: Article
Language:English
Subjects:
Adiabatic flow
Domain walls
Ferrous alloys
Magnetic alloys
Magnetic domains
Magnetic fields
Nanowires
Torque
Transmission electron microscopy
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Summary: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 quasi-particle in a 1D potential landscape. By injecting small currents, the potential is modified, allowing for the determination of the non-adiabatic spin torque: the non-adiabatic coefficient is 0.010 +/- 0.004 for a transverse DW and 0.073 +/- 0.026 for a vortex DW. The larger value is attributed to the higher magnetization gradients present.
ISSN:2331-8422
DOI:10.48550/arxiv.1005.1168