Fig. 6: SOT-driven motion of DW stabilized by IP anisotropy.
From: Néel domain walls with bistable chirality in a perpendicularly magnetized ferrimagnetic insulator
a Example of sequential images of the DW position captured after applying a current pulse between each frame (with pulse width 12 ns and pulse amplitude 9.2\(\times {10}^{11}{{\rm{A}}}/{{{\rm{m}}}}^{2}\)) without an external field. b DW velocity \(v\) plotted as a function of the IP field \({H}_{x}\) for three selected current densities, corresponding to the low (4.9\(\times {10}^{11}{{\rm{A}}}/{{{\rm{m}}}}^{2}\)), intermediate (6.2\(\times {10}^{11}{{\rm{A}}}/{{{\rm{m}}}}^{2}\)), and high (12.8\(\times {10}^{11}{{\rm{A}}}/{{{\rm{m}}}}^{2}\)) current density regime, respectively. Error bars in DW velocity are obtained from the linear fit of DW displacement to pulse number. c DW velocity \(v\) plotted as a function of the current density under zero field. Experimental data points are plotted as black circles, and the solid red curve represents the fit to the analytical 1D DW model (see Methods). Dashed gray plots represent the analytical model with the two limiting cases of infinitely large IP anisotropy field (\({H}_{k,{IP}}\to \infty\)) and a \(50{{\rm{Oe}}}\) DMI field with zero IP anisotropy field (\({H}_{k,{IP}}=0{{\rm{Oe}}}\), \({H}_{D}=50{{\rm{Oe}}}\)), while other parameters are kept the same as the fit. d Calculated DW internal magnetization angle \(\psi\) from the analytical models for the fit (red), the two limiting cases \({H}_{k,{IP}}\to \infty\) and \({H}_{k,{IP}}=0{{\rm{Oe}}}\), \({H}_{D}=50{{\rm{Oe}}}\) (dashed gray).
