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(a) Normalized Hall resistance as a function of the applied perpendicular external field at a constant cryostat temperature . The curves with filled squares and solid lines correspond to the preparation of the DWs, while each point of the curves with open squares and dotted lines is measured after the injection of a single pulse with a current density of . (b) Scanning electron microscopy image of the Hall cross used to detect the position of the DW. The current (I) and voltage (V) contacts are indicated.
as a function of the injected current density for a constant cryostat temperature and for both initial magnetization configurations. The measurement points represent the mean values of averaged over at least eight repetitions, while the error bars show the standard deviation.
The deduced contributions for spin torque and for Oersted field (inset). The efficiency is deduced from a linear fit through the origin (zero spin torque for zero current density) using the points with the lowest Oersted field contribution.
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