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. Author manuscript; available in PMC: 2018 Aug 1.
Published in final edited form as: Nat Photonics. 2018 Jan 26;12(2):73–78. doi: 10.1038/s41566-017-0086-z

Figure 2. Magneto-optical Kerr rotation in the non-collinear antiferromagnet Mn3Sn at 300 K.

Figure 2

Field dependence of a, the polar magneto-optical Kerr rotation angle θK for the (21̄1̄0)-plane in B ‖ [21̄1̄0], and b, the longitudinal magneto-optical Kerr rotation angle θK of the (21̄1̄0)-plane measured along φ = 0–90 degrees (Methods). c, Schematic illustrations of sample configurations for the polar and longitudinal magneto-optical Kerr effects (MOKE) (Methods). d, Polar MOKE spectroscopy of the (21̄1̄0)-plane from 400 nm to 1100 nm under zero magnetic field (Methods). Inset: Polar Kerr rotation spectrum obtained using the first-principles calculation with the smearing parameter of η = 0.4 eV (Methods). The rotation angle slightly changes with M, and there is almost no change in the angle between M = 0 and 0.005 µB/f.u. Since the observed M is just ~0.005 µB/f.u. (~0.002 µB/Mn), we may conclude that M plays just a minor role in the MOKE.