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Effect of He + ion irradiation on domain wall dynamics: (a) domain wall velocity versus out-of plane field pulse amplitude µ0Hz for different irradiation fluences; (b) the same curves plotted in semi-log scale as a function of (µ0Hz) −1/4 showing the linear trend expected for the creep regime. The solid and dashed lines correspond to fits of Eqs. 1 for the creep and depinning regime, respectively.
Source publication
We have studied the effect of He$^+$ irradiation on the dynamics of chiral domain walls in Pt/Co/AlOx trilayers in the creep regime. The irradiation leads to a strong decrease of the depinning field and a non-monotonous change of the effective pinning barriers. The variations of domain wall dynamics result essentially from the strong decrease of th...
Contexts in source publication
Context 1
... by the non-isotropic displacement of the DWs in the presence of a static in-plane magnetic field µ 0 H x (not shown). The strength of the DMI interaction was obtained from the DW saturation velocity at large B z fields v sat = γπD/(2M s ) [19,23]. The domain wall velocities driven by out-of-plane magnetic fields up to 200 mT are reported in Fig. 1 for the samples in the pristine state and after irradiation. As it can be observed, the strongest trend is a shift of the curves towards low field values with increasing irradiation fluence. More quantitative insights on the DW dynamics can be deduced from the self-consistent description of the creep and depinning regimes proposed in ...
Context 2
... depend on the film magnetic and pinning properties: the depinning temperature T d characterizing the height of the effective pinning barrier, the depinning field H d and the velocity v(H d ), corresponding to the coordinates of the crossover between creep and depinning. The good agreement between the experimental curves and the fit using Eqs. 1 ( Fig. 1(a-b)) evidences the crossover between the creep and depinning regimes. The evolution of the depinning parameters with the irradiation fluence is reported in Fig. 2. The irradiation has no effect on the depinning velocity v(H d ), which remains rather constant. T d varies slightly with a non-monotonous trend. In contrast, H d decreases by a ...
