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Abstract-Coupling between diffraction gratings and magneto-optics can provide a non-conventional means of observation of a domain structure as shown by magnetic patterns typically sized near to the wavelength A.In the case of a simple unidimensional binary relief grating, diffraction can reveal surprising magneto..optical reemission properties. Modelling the behaviour of such an object gives quite satisfying results in the framework of a perturbative approach of the Rayleigh theory.In the present paper we analyse any interesting features (Littrow mounting for diffracted orders, enhancement of magneto-optical signal for various orders) concl:rning the magneto-optical part of the diffracted light for a transverse Kerr effect configuration. When the grating is made of soft magnetic lines deposited on a non magnetic substrate, diffraction measurements and studies give additional statistical informations about the collective magnetic behaviour. A model based on the average magnetisation distribution and the scalar theory of diffraction allows to plot hysteresis loops in good agreement with the experimental ones.

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