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(a) Lorentz image of Py NW as fabricated, with inset showing enlarged view of trapezoid notch. (b) Phase shift, (c) reconstructed magnetic induction map, and (d) calculated magnetic induction map of Py NW at remanent state. Field directions indicated by color wheel or overlaid arrows.
Montage showing representative states during DW motion indicated in Fresnel images (top) and corresponding magnetic induction maps (bottom), as extracted from pairs of holograms. (I) DW nucleation, (II) DW injection, (III) DW pinning, and (IV) DW depinning during forward half-cycle. (V) DW nucleation, (VI) DW injection, and (VII) DW pass-through for reverse half-cycle. Initial saturation direction and applied field direction for each half-cycle as indicated by white and black arrows. Directions in magnetic induction maps indicated by color wheel or overlaid arrows.
(a) Schematics of representative configurations, corresponding to states I–VII in Fig. 2, respectively. (b) Simulated hysteresis loop showing extra plateau labeled III due to asymmetrical DW pinning during NW reversal. (c) Distribution of critical fields to emerge specific well-defined states (II, III, IV, VI, and VII) during DW propagation.
(a) Experimental and (b) simulated magnetic induction maps for DW pinning state. (c) Experimental and (d) simulated magnetic induction maps of VDW obtained after NW relaxation in zero field. Directions indicated by color wheel in Fig. 2.
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