Abstract
Bragg-regime diffraction by a thick magnetic phase grating is observed for the first time at perfectly transparent ferromagnetic stripe domains in ${\mathrm{K}}_{2}$Cu${\mathrm{F}}_{4}$ below ${T}_{C}=6.2$ K in the visible region. The diffracted beams are perpendicularly polarized with respect to the incident and the transmitted beam. The diffraction vanishes by virtue of a new waveguiding mechanism owing to total reflection at the spatially thick, but optically thin, domain walls, if the incident light is polarized parallel to the crystalline $a$ axis.
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