The magnetic properties of iron in chromium and in chromium rich alloys are tentatively interpreted in terms of a local coupling with the spin modulation of the matrix. The Curie Weiss behaviour of isolated iron atoms in the transversal uncommensurate phase is related to possible long range distortions of the spin modulation due to the thermal motion of the iron moments. This motion is frozen in the commensurate phase. Pairs of nearest neighbour iron atoms behave in a superparamagnetic way in all antiferromagnetic phases

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