Figure 3: Quantitative determination of intrinsic energy barrier.
From: Two-barrier stability that allows low-power operation in current-induced domain-wall motion
(a) Typical examples of time evolution of AHE signal for electric-current-driven DW depinning. (b) Distributions of depinning time td at various current strengths: 0.36 mA (black), 0.35 mA (red), 0.34 mA (green), 0.33 mA (blue), 0.32 mA (olive), 0.31 mA (magenta) and 0.30 mA (purple). All histograms were obtained from 300 repeated measurements. Here, the current is the value flowing along the magnetic layer (Co/Ni) (c), Cumulative distribution functions of the td values whose histograms are shown in Fig. 3b. Different colors correspond to the different current strengths, which is same with Fig. 3b. Solid lines show the best fittings to the form P(td)=1−exp(−td/τ). (d) Characteristic depinning time τ as a function of current obtained from Fig. 3c. Error bars show s.d., and the blue solid line is the best-fit line based on the Arrhenius law.
