(a) Schematic diagrams indicating the experimental geometry and applied field sequence used to transport DWs around nanowires in 1D propagating potential wells. (b) (Black solid line) MOKE signal plotted against Hx for an 800 nm wide nanowire for Happ = 60 Oe and ν = 27 Hz and (red dashed line) ideal signal for zero DW lag. (c) (Black solid line) MOKE signal plotted against Hy and (red dashed line) ideal signal for zero DW lag. (d) shows the same measurement plotted as a function of applied field angle. The dashed lines indicate the expected positions of the peaks for θlag = 0. (e) AFM image of a ring-shaped nanowire with d = 20 μm and w = 800 nm.
Effect of the applied field amplitude (Happ) on the DWs propagation. Results are shown for nanowires with w = 800 nm (▪), 600 nm (•), 400 nm (▲) at a constant field frequency of ν = 27 Hz. (a) shows measured values of θlag plotted against Happ. These data were then used to derive plots of (b) Hpara, (c) Hpara/Happ, and (d) Htrans/Happ.
(a) Experimental and modeled MOKE signals plotted as a function of time over one complete field cycle. Experimental data are shown for Happ = 40 Oe (•) and Happ = 250 Oe (▲). Modeled signals are shown for both ▪ “DWs” and ▼ “saturated” cases. The differential of these signals are shown in (b). (c) FFT of the “saturated” modeled signal. (d) FFT of the “DWs” modeled signal. (e) FFTs of experimental signals for Happ= 40, 80, 150, and 250 Oe. (f) Amplitudes of the 3rd (81 Hz) and 5th (135 Hz) harmonics as found from FFTs of experimentally measured signals.
(a) Effect of the applied field frequency (ν) on the DWs propagation. Results are shown for nanowires with w = 800 nm (▪), 600 nm (•), 400 nm (▲) at a constant field amplitude of Happ = 80 Oe. (a) shows measured values of θlag plotted against ν. (b) shows values of Hpara derived from these data, along with fits using Eq. (1) .
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