Figure 1

(a) Theoretical variation of the velocity, $v$, of a 1D interface (domain wall) in a 2D weakly disordered medium submitted to a driving force, $f$ (magnetic field, $H$), at zero and finite temperature, $T$. The creep, depinning, and flow regimes are labeled. (b) Regimes of domain-wall flow motion in an ideal ferromagnetic film without pinning. The steady and precessional linear flow regimes are separated by an intermediate regime which begins at the Walker field, $H_W$.Reuse & Permissions

Figure 2

(a) Waveforms of field pulses of equal magnitude but differing duration used to move the walls. (b) Subtracted domain image where the light area corresponds to the area swept out by the domain walls during a high field pulse. (c) Domain-wall velocity, $v$, versus applied magnetic field, $H$, for the $t_{\mathrm{Co}}=0.5\mathrm{nm}$ and $t_{\mathrm{Co}}=0.8\mathrm{nm}$ samples. We show a $v=mH$ fit to the high field flow data (dashed line) and a fit of Eq. (1) to the low field creep data (solid line). The insets show domain images in the $t_{\mathrm{Co}}=0.8\mathrm{nm}$ film at fields which lie within the creep and flow regimes. The white scale bars are $5\mu \mathrm{m}$ long. (d) Natural logarithm of the wall velocity versus the scaled applied field to demonstrate low field creep. The solid lines are fits of the creep velocity expression [Eq. (1)]. (e) Examples of how the limited maximum applied field and low field creep prevent observation of multiple flow regimes (dotted curve) in the experimental data (solid curve—schematic only).Reuse & Permissions