Fig. 5: Thickness dependence of the broadband nonreciprocal response.

a Fine magnetic field dependence of the emissivity from 12.5 μm to 15 μm for a thick (black) and thin (green) sample. The thick sample shows a stronger magnetic field dependence than the thin one. b Simulated Δ e spectra for varying sample thickness. We observe stronger tuning overall for thicker samples; however the tuning is increasingly skewed blue. Small tuning of the back reflector at 6 μm is also seen in the experimental measurements of the absorptivity (Fig. S3). c The average change in the emissivity from 12.5 μm to 15 μm for changing sample thickness. The green and black stars are the experimentally measured values. The angle in this is held at θ = 60°, and it should be noted that changing the thicknesses of the constituent ENZ layers will also influence the directionality