Article

Nonadiabatic spin torque investigated using thermally activated magnetic domain wall dynamics.

Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
Physical Review Letters (impact factor: 7.37). 07/2010; 105(5):056601.
Source: PubMed

ABSTRACT 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: βt=0.010±0.004 for a transverse DW and βv=0.073±0.026 for a vortex DW. The larger value is attributed to the higher magnetization gradients present.

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Keywords

Arrhenius law
 
domain walls
 
higher magnetization gradients present
 
injecting small currents
 
one-dimensional potential landscape
 
positions
 
room temperature
 
thermally activated motion
 
transmission electron microscopy
 

M. Eltschka