Fig. 1: Experimental observation of the ultrafast modulated Voigt effect in Mn3Sn film.
From: Large ultrafast-modulated Voigt effect in noncollinear antiferromagnet Mn3Sn
a Non-collinear inverse triangular spin structure of Mn3Sn. Purple and blue spheres with arrows represent Mn spins; small dark gray spheres represent Sn atoms. b Schematic experimental setup. The 400-nm pump laser pulse (blue) induces a quench of AFM order, and the 800-nm probe laser pulse (red) detects ΔP via crossed polarizers. The sample can be rotated around the z axis parallel to \([11\bar{2}0]\). The sample orientation in the schematic is θ = 0°. β and φ describe the polarizer angle and probe light polarization angle, respectively. Δt represents the time delay. c Time evolution of the ΔP at room temperature for sample orientation of θ = 45° and θ = 0°. θ = 0° corresponds to the crystallographic direction \([\bar{1}100]\) parallel to the x axis. d Comparisons of the ΔR and ΔP at T = 300 K.
