Figure 2: Quantitative determination of extrinsic 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 magnetic-field-driven DW depinning. (b) Distributions of depinning time td at various magnetic field strengths: 338.6 Oe (black), 337.8 Oe (red), 336.1 Oe (green), 334.4 Oe (blue), 332.9 Oe (olive) and 331.8 Oe (magenta). Histograms were obtained from 300 repeated measurements except for 331.8 Oe (100 measurements). (c) Cumulative distribution function of td values whose histograms are shown in Fig. 2b. Different colors correspond to the different field strengths, which is same with Fig. 2b. Solid lines are the best-fit lines based on the equation P(td)=1−exp(−td/τ). (d) Characteristic depinning time τ as a function of magnetic field obtained from Fig. 2c. Error bars show s.d., and the solid line is the best-fit line based on the Arrhenius law.
