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Domain walls in ring-shaped nanowires under rotating applied fields
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10.1063/1.4812388
/content/aip/journal/jap/114/1/10.1063/1.4812388
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/1/10.1063/1.4812388

Figures

Image of FIG. 1.
FIG. 1.

(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 H for an 800 nm wide nanowire for H = 60 Oe and ν = 27 Hz and (red dashed line) ideal signal for zero DW lag. (c) (Black solid line) MOKE signal plotted against H 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 θ = 0. (e) AFM image of a ring-shaped nanowire with d = 20 m and w = 800 nm.

Image of FIG. 2.
FIG. 2.

Effect of the applied field amplitude (H) 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 θ plotted against H. These data were then used to derive plots of (b) H, (c) H/H, and (d) H/H.

Image of FIG. 3.
FIG. 3.

(a) Experimental and modeled MOKE signals plotted as a function of time over one complete field cycle. Experimental data are shown for H = 40 Oe (•) and H = 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 H= 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.

Image of FIG. 4.
FIG. 4.

(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 H = 80 Oe. (a) shows measured values of θ plotted against ν. (b) shows values of H derived from these data, along with fits using Eq. (1) .

Tables

Generic image for table
Table I.

Best fit parameters when using Eq. (1) to fit the data shown in Fig. 4(d) .

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/content/aip/journal/jap/114/1/10.1063/1.4812388
2013-07-01
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Domain walls in ring-shaped nanowires under rotating applied fields
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/1/10.1063/1.4812388
10.1063/1.4812388
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