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(Color online) oommf model of formation of 360DW in a wire attached to a circular pad. (a) After 239 kA/m saturation along y, a 180DW formed in the wire, shown at remanence. (b) A further field of −4.0 kA/m along y produced a second 180DW. (c) The remanent state showing a 360DW. (d) Repeated alternating field of magnitude 9.5 kA/m along y generated multiple domain walls. Red and blue (or greyscale shading) represent the sign of the x-component of the magnetization.
(Color online) (a) MFM data of a 360DW imaged at a tip height of 20 nm. The 360DW shows as two contiguous bright and dark contrast regions, and the shapes of the wire and injection pad are evident. The inset shows part of the wire segment of another sample imaged at a height of 100 nm in which two spatially separated 180DWs are present, indicated by arrows, one with bright contrast and one with dark contrast, but they do not form a 360DW. The contrast is weaker but a larger separation between the dark and light contrast is evident. (b) sempa image of the sample of (a) with the in-plane magnetization direction indicated on a color wheel. (c) The angle between the magnetization and the axis of the wire, measured along the dashed line shown in (b) (green, noisy curve) and calculated from the micromagnetic simulation of Fig. 3(a) (blue, smooth curve). (d) sempa image of the sample in the inset of (a), showing a pair of separated 180DWs. The uncertainty in the magnetization direction for the sempa data is 17.1° (one standard deviation).
(Color online) (a) oommf simulation of a 360DW in a wire. The magnetization directions are plotted on a color wheel. (b) In-plane stray field magnitude calculated at a height of 3 nm above the surface of the sample. The white arrows represent the in-plane direction of the field at its greatest magnitude. (c) Calculated z-component of the stray field at a height of 3 nm above the surface of the sample.
(Color online) (a) sempa image of a 540DW. (b) sempa image after injecting an additional 180DW. (c) A 540DW of opposite sense to that of (a) adjacent to a 180DW. Magnetization directions are indicated on a color wheel. The uncertainty in the sempa angular data is 7.4° (one standard deviation). Scale bars are 250 nm.
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