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The alloy (Fe 0.65 Ni 0.35 ) 1-x Mn x with x = 0.11 is a re-entrant spin glass (RSG) with a strong irreversible mixed phase inside the RSG phase. In this phase the strong history dependence is shown by the size of ferromagnetic cluster on a mesoscopic length scale. To observe these mesoscopic clusters small angle neutron scattering (SANS) measurements were made. The results were fitted to squared Lorentzian and a Lorentzian with general exponent. Two different correlation lengths were found.