Magnetic properties of Co1-xMxPt3 (M  Mn, Fe) compounds with competing interactions

Abstract

Magnetic properties of the pseudo-binary Co1-xMxPt3 (M  Mn, Fe) compounds have been investigated. Under adequate preparation conditions, these compounds display the L12 structure. For M  Mn the magnetic phase diagram presents a continuous ferromagnetic region from CoPt3 to MnPt3 with a re-entrant spin glass (RSG) phase emerging at low T and H between x = 0.2 and 0.6. For M  Fe, a spin glass (SG) phase separates the ferromagnetic region on the Co-rich side, from the antiferromagnetic region on the Fe-rich side. The results are qualitatively discussed in terms of the three dominant competing magnetic interactions JCoCo, JCoM, JMM.