Abstract

We present the structural and magnetic properties of a multiferroic Ba₂Mg₂Fe₁₂O₂₂ hexaferrite composite containing a small amount of MgFe₂O₄. The composite material was obtained by auto-combustion synthesis and, alternatively, by co-precipitation. The Ba₂Mg₂Fe₁₂O₂₂ particles obtained by co-precipitation have an almost perfect hexagonal shape in contrast with those prepared by auto-combustion. Two magnetic phase transitions, responsible for the composite’s multiferroic properties, were observed, namely, at 183 K and 40 K for the material produced by auto-combustion, and at 196 K and 30 K for the sample prepared by co-precipitation. No magnetic phase transitions in these temperature ranges were observed for a MgFe₂O₄ sample, which shows that the magnesium ferrite does not affect the multiferroic properties of this type of multiferroic metarials.

Keywords: Auto-combustion synthesis, Ba₂Mg₂Fe₁₂O₂₂, co-precipitation, MgFe₂O₄, multiferroic composite, multiferroics properties, Y-type hexaferrite.