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The magnetic properties as function of atomic volume and the environmental effect for Mn_xNi_1-x alloy system have been studied in the compositional range 0.20<x<0.3. A strong effect of chemical ordering on the magnetic structure was found. The ferromagnetic ordering is favorite by chemical disorder while a magnetic and/or chemical ordering lead to a spin flip of Mn magnetic moment especially when the atoms forms a L1₂ symmetry for spins or chemical composition. The AF states are of the DLM form for x<0.20.

Keywords: alloys, ferromagnetism, KKR-CPA, short range order, disordered local moment model