Fig. 4: Wall chirality switching behavior and its dependence on IP field pulse width and amplitude.
From: Néel domain walls with bistable chirality in a perpendicularly magnetized ferrimagnetic insulator
a Example line scans of the probability of successfully switching the wall chirality, \({P}^{{{\rm{sw}}}}\), as a function of the switch pulse amplitude \({H}_{x}^{{{\rm{sw}}}}\) at different pulse widths \({\tau }^{{{\rm{sw}}}}\). With the DW initialized to be CCW for an up-down wall, an IP field pulse with pulse width \({\tau }^{{{\rm{sw}}}}\) and pulse amplitude \({H}_{x}^{{{\rm{sw}}}}\) is applied to switch the DW to CW. Solid lines are error functions fitted to the experimental data. b Phase diagram for wall chirality switching. \({\mathrm{ln}}({\tau }^{{{\rm{sw}}}}(s))\) is plotted against the threshold pulse amplitude, \({H}_{x,c}^{{{\rm{sw}}}}\) which are extracted from the error function fit to each line scan. Error bars plotted are obtained from the fit. The red solid line is a linear fit to the plotted data, showing the negative correlation between pulse amplitude and width required for switching the DW chirality. In the red (blue) colored region, switching (not switching) events occur deterministically. In the gray-colored region, switching occurs probabilistically. c Global fitting using the expression \({\mathrm{ln}}\left(\right.-{\mathrm{ln}}\left(1-{P}^{{{\rm{sw}}}}\right)-{\mathrm{ln}}{\tau }^{{{\rm{sw}}}}=\frac{p{H}_{x}^{{{\rm{sw}}}}}{{kT}}+{\mathrm{ln}}\nu -\frac{{E}_{a}^{0}}{{kT}}\) to extract the energy barrier for DW chirality switching, \({E}_{a}^{0}\) and the lowering of the energy barrier by the applied IP field, \(p{H}_{x}^{{{\rm{sw}}}}\).
