Fig. 4: Visualization of the Néel vector reversal with an electric field.

a–g Selected Aʹ images of an X-plane sample for k_X > 0 at 43.7 K (< T_N) in a cyclic electric field (E_Z = 0 → +250 → −250 → +250 kV m⁻¹) with a constant bias magnetic field (μ₀H_Y = 0.15 T). Here, Aʹ is the variation of absorption coefficient from 50 K (> T_N). Dark and bright regions correspond to L_+Y and L_−Y domains, respectively. Scale bar below (a) is 0.2 mm. h The E_Z dependence of population of L_+Y domains derived from the areal ratio of dark and bright regions in a series of Aʹ images. The data points with alphabets (a–g) correspond to the images (a)–(g), respectively.