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Magnetic behaviour of multiferroic Bi0.90Yb0.10FeO3 and Bi0.90La0.10FeO3

Multiferroics are multifuctional materials that exhibit multiple ferroic orders at the same time. Recently, considering their technological applicability, significant effort has been made to find new ways how to control ferroelectric and magnetic orderings within different kind of materials. One of the most investigated perovskite multiferroics, bismuth ferrite (BiFeO3), is a good candidate for technological use because of high ferroelectric and magnetic ordering temperatures. Pure BiFeO3 exhibits antiferromagnetic order which results with low net magnetic moment. One way to disturb antiferromagnetic order is doping of BiFeO3 with heavy rare earth elements. We have thoroughly investigated high and low temperature magnetic properties of BiFeO3 where 10% of Bi atoms were substituted with Yb and La and results were compared with pure BiFeO3 . All the samples were prepared using the hydro-evaporation procedure. Zero field cooled (ZFC) and field cooled (FC) magnetization curves indicate development of the weak ferromagnetism. Magnetic hysteresis loops measured at the low temperature (5 K), room temperature, and high temperatures, just under and above transition temperature (around 630 K), also suggest weak ferromagnetic behavior with high coercive field. Complete magnetic results in full temperature range (2-800K) clearly indicate enhancement of the weak ferromagnetism after performed substitution with rare earth elements. The authors acknowledge the financial support of the Croatian Science Foundation under the project UIP-2014-09-8276 and Ministry of Education and Science of Republic of Serbia (project number III45007).

multiferroics, bismuth-ferrite, rare earth doping, weak ferromagnet, ferroelectric

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