Abstract
Magnetic phase transitions as a function of concentration and temperature for ordered and disordered (Mn1-xFex)Pt3 alloys are investigated by neutron diffraction and magnetic measurements. On the basis of these results the magnetic phase diagrams are drawn. The diagram for the ordered alloys is characterized by a tricritical point in the region of the ferromagnetic-to-antiferromagnetic transition at Xc=2/3. A canted noncollinear magnetic structure and a region of two-phase mixtures are shown. The diagram for the disordered alloys is characterized by two regions of heterogeneous ferromagnets, both showing re-entrant spin-glass states at low temperatures, but differing in the character of exchange interaction between magnetic atoms. The diagrams are discussed within the framework of the phenomenological theory of the phase transitions with related order parameters.
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