Eﬀect of Co-Doping on Magnetic Properties of Bismuth Ferrite
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The eﬀect of co-doping on structure and magnetic properties of the BiFeO3-based multiferroics with a partial isovalent substitution of bismuth for La3+, Gd3+, Dy3+, and Er3+ ions have been experimentally investigated by X-ray diﬀraction and magnetic methods. The ceramic R1xR20.2−xBi0.8FeO3 type (x = 0, 0.05, 0.10, 0.15, 0.20; R1, R2 = La, Gd, Dy, Er) samples have been prepared by a solid-state reaction method under cold pressing at high pressure P = 4 GPa. Temperature dependences of magnetization for the co-doped BiFeO3 demonstrate magnetic “weak ferromagnetic–antiferromagnetic” phase transitions in a high temperature range T = 550–650 K. The presence of a weak ferromagnetism in all compositions is conﬁrmed by open loops of magnetic ﬁeld dependences. It has been found out that the magnetic characteristics strongly depend on the degree of substitution, temperature, and magnitude of magnetic ﬁeld.