Due to the revolution in Information Technology, demand of portable digital devices has increased extensively. The efficiency and miniaturization of those devices greatly depends up on the efficiency of the installed permanent magnets. Current rare-earth based commercial magnets are considered "critical" because of the key constituent of them i.e. Sm, Nd, and Dy are rare and pose a supply security risk. Finding Ce based, transition metal rich, ferromagnetic compounds is the one of the possible solutions to the current criticality issue of rare-earth based permanent magnets. Ce based ferromagnetic compounds are interesting from the theoretical and experimental perspective because the Ce ion exhibits local moment bearing Ce~(3+) ion, non-magnetic Ce~(4+) ion, mixed valencies and itinerant magnetism. Due to these diverse magnetic properties of Ce based compounds, there is a great potentiality of finding the new Ce based ferromagnetic compounds and possibility of improving the magnetic properties of the existing ferromagnetic materials. Here we will summarize some of our explorations on effect of substituting elemental Mg in various Ce-Co compounds.
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