Fig. 1: Creation and positioning of wide antiphase Néel DWs.
From: High-speed antiferromagnetic domain walls driven by coherent spin waves
a Crystal and magnetic structure of the Cu3O4 plane of Sr2Cu3O4Cl2 below TN,I. b Creation of an antiphase DW at a 90° DW. The bottom row shows SHG images of the process at different applied magnetic field (H) and horizontal laser positions (xlaser), while the top row shows a schematic of the domain configuration, labeled by their in-plane moment m. The resulting antiphase DW configuration is depicted in the bottom right. The imaging laser is horizontally polarized (along x axis). c SHG images of an antiphase DW at different xlaser. d SHG image of antiphase DW with vertically polarized laser. Rotational anisotropy polar plots of the SHG intensity (for P-polarized input and output electric field polarization measured as a function of the scattering plane angle φ) are shown for selected locations. φ = 0 corresponds to the x direction. The solid lines are fits to a coherent superposition of crystallographic electric quadrupole (EQ) and AFM-induced magnetic dipole (MD) SHG processes, as described in ref. 50. The EQ and MD processes shown in the figure represent the Pin-light-induced nonlinear polarization projected along Pout. Filled and unfilled lobes indicate opposite phases. The DW SHG pattern is fit to a three-domain averaged expression, as described in Supplementary Section 1. e Line cut of the SHG image intensity perpendicular to an antiphase DW. The solid line shows a fit to the SHG intensity of a DW profile (see Methods) with an extracted DW width πλ = 8.98(22)μm.
