Intrinsic nature of the magnetization enhancement in heterovalently doped Bi(1-x)A(x)FeO(3) (A = Ca, Sr, Pb, Ba) multiferroics


The mechanism of the formation of heterovalent-substitution-induced defects as well as their influence on the magnetic properties of BiFeO3-based multiferroics has been studied. It has been shown that heterovalent A(2+) substitution results in the formation of oxygen vacancies in the host lattices of both antiferromagnetic and weak ferromagnetic Bi(1-x)A(x) FeO3 (A = Ca, Sr, Pb, Ba; x = 0.2, 0.3) compounds, thus indicating the intrinsic (i.e. not related to defects themselves) mechanism of doping-induced enhancement of magnetization. A correlation between the ionic radius of the substituting element and the value of the spontaneous magnetization of the corresponding solid solution has been found. The experimental results suggest that A-site substitution with the biggest ionic radius ions effectively suppresses the spiral spin configuration of antiferromagnetic BiFeO3.






Khomchenko, VA; Kopcewicz, M; Lopes, AML; Pogorelov, G; Araujo, JP; Vieira, JM; Kholkin, AL

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