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The magnetization behaviors of GdMn2Ge2 and TbMn2Ge2 in the bulk and in thefine particles obtained by high-energy ball-milling are compared. Pronouncedmodificayions in the spontaneous, remnent and high-field magnetization in thefine particle form, attributable to Mn are observed. The results indicate thatthe antiferromagnetism of Mn sub-lattice known for the bulk form in the range100-300 K gets weakened in favor of ferromagnetism in the fine particles. Onthe basis of this observation, we infer that there are other factors like size(and possibly defects) also play a role to decide the exact nature of magneticordering of Mn in this ternary family of compounds, contrasting thetraditionally held view that the basal plane Mn-Mn distance is the crucialcontrolling parameter.

Ferromagnetic feature from Mn near room temperature in the fine particles of GdMn2Ge2 and TbMn2Ge2