Magnetic properties and magnetic phase diagram of frustrated Co1−xFexPt3 compounds : The 41st annual conference on magnetism and magnetic materials

1089-7550

AIP Digital Archive

Physics

The investigation of the magnetic properties of the pseudobinary Co1−xFexPt3 L12 ordered compounds resulting from alloying ferromagnet CoPt3 and frustrated antiferromagnet FePt3 is reported. The magnetic phase diagram of this system shows the presence of a pure spin glass phase that separates the ferromagnetic region from the antiferromagnetic one. On the Co-rich side (x〈0.6), two re-entrant spin glass phases are found to emerge at low temperature in the ferromagnetic region. On the iron-rich side, an antiferromagnetic region with two antiferromagnetic [〈fraction SHAPE="CASE"〉12 〈fraction SHAPE="CASE"〉120] and [〈fraction SHAPE="CASE"〉1200] structures is observed for 1≥x≥0.8. This magnetic phase diagram is discussed comparatively with the previously determined (Fe–Mn)Pt3 and (Co–Mn)Pt3 phase diagrams. The randomness of the average exchange interaction is suggested to arise from a competition between the three dominant magnetic interactions JCoCo, JFeFe, and JCoFe of 3d atoms in sites of second nearest neighbors in the L12 structure. © 1997 American Institute of Physics.

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