Fig. 4: Spatially-resolved images of nematic (single-Q) AFM domains in Co1/3TaS2, acquired via scanning MLD microscopy.
From: Tunable chiral and nematic states in the triple-Q antiferromagnet Co1/3TaS2
a Three 76 × 70 μm images of MLD at T ≈ 27 K and H=0 and (in phase III), using linearly-polarized light modulated between ϕ = 0°/90°, 120°/210°, and 240°/330° with respect to the Co1/3TaS2 a-axis. Depending on ϕ, different spatial regions show large and positive MLD signal. (Note: from each image, an MLD image in the nonmagnetic phase at 38 K was subtracted, reducing background signals). All scale bars are 10 μm. b Polar plots of the measured MLD versus ϕ, measured at the three locations indicated. These polar plots demonstrate C2z symmetry of the single-Q (stripe) AFM order, mutually rotated by 120°, and depicted in the diagrams below where red/blue dots indicate Co spins oriented into/out of the page. c Spatial map of the measured nematic director, revealing domains oriented along the indicated directions. d Nematic director map overlaid with the first MLD image shown in a.
