The binary oxide composite, consisting of rock salt-type SrO and spinel Co3O4 nano-domains, exhibits soft ferromagnetic properties at ambient temperature. This ferromagnetism is originated from interface-induction, and the magnitude of the magnetic properties can be enhanced when the spinel phase of the composite is doped by a small amount of Ln(2)O(3) (Ln = La, Nd, for instance). In this work, we study the composites of tri-oxide, 1/2(1 - x)Ln(2)O(3)-xSrO/l/3Co(3)O(4), where 0.01 <= 1 - x <= 0.6, by focusing on three areas: (i) generation of nano-composite dominant by interfacial phase via the pyrolysis of preceramic metallo-organic gel; (ii) influence of post-pyrolysis calcination and Ln(2)O(3) content on the phase composition of the composite; and (iii) elucidation of different magnetic responses caused by the nature of Ln(2)O(3) dissolved in the Co3O4 phase. The Ln(3+)-doped Co3O4 oxide displays only paramagnetic behavior at room temperature, but the ferromagnetic response is attained upon its mixing with SrO in nano-scale. The SrO phase plays the role in assisting Co3O4 phase with aligning unpaired electrons through interfacial induction. (c) 2006 Elsevier Inc. All rights reserved.