Multiferroic ceramics Bi0.9La0.1FeO3 are synthesized by solid-state reactions and sintered at various temperatures.The rhombohedral structure with the space group R3c is confirmed by means of x-ray diffraction,and the...Multiferroic ceramics Bi0.9La0.1FeO3 are synthesized by solid-state reactions and sintered at various temperatures.The rhombohedral structure with the space group R3c is confirmed by means of x-ray diffraction,and their multiferroic properties are investigated.Bi_(0.9)La_(0.1)FeO_(3) ceramics sintered at 880℃ are found to have the lowest leakage current density and the largest saturated polarization among all the samples.A diode-like currentvoltage hysteresis that could be switched by an external voltage is observed in the Bi_(0.9)La_(0.1)FeO_(3) ceramics.A typical “butterfly” shaped strain-versus-voltage curve is shown with a maximum strain of 0.09%o at 7kV.Roomtemperature magnetization exhibits a hysteresis loop,indicating that the modulation of the spin structure of BiFeOa has been suppressed.展开更多
The magnetoresistance(MR)behavior of La_((2-x)/3)Bi_(x/3)Ca_(l/3)MnO_(3)(x=0.4)compound was investigated.The compound exhibits complex magnetic transitions,i.e.,paramagnetic-canted ferromagnetic-ferromagnetic-spin gla...The magnetoresistance(MR)behavior of La_((2-x)/3)Bi_(x/3)Ca_(l/3)MnO_(3)(x=0.4)compound was investigated.The compound exhibits complex magnetic transitions,i.e.,paramagnetic-canted ferromagnetic-ferromagnetic-spin glass transitions.The temperature dependence of resistivity of the compound indicates a semiconducting behavior,and no semiconductor-metal transition was associated with these magnetic transitions.The magnetoresistance ratio exhibits a critical maximum corresponding to the canted ferromagnetic transition.A MR ratio as large as 86%was observed at 85 K.The temperature dependence of MR ratio is well described by the relation of(ρo-ρH)/ρo=A(M/M_(s))^(2).展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11004148,51074112,11104202,51001115 and 11074295the Natural Science Foundation of Tianjin(11JCYBJC02700,11JCZDJC22100,11JCZDJC21800).
文摘Multiferroic ceramics Bi0.9La0.1FeO3 are synthesized by solid-state reactions and sintered at various temperatures.The rhombohedral structure with the space group R3c is confirmed by means of x-ray diffraction,and their multiferroic properties are investigated.Bi_(0.9)La_(0.1)FeO_(3) ceramics sintered at 880℃ are found to have the lowest leakage current density and the largest saturated polarization among all the samples.A diode-like currentvoltage hysteresis that could be switched by an external voltage is observed in the Bi_(0.9)La_(0.1)FeO_(3) ceramics.A typical “butterfly” shaped strain-versus-voltage curve is shown with a maximum strain of 0.09%o at 7kV.Roomtemperature magnetization exhibits a hysteresis loop,indicating that the modulation of the spin structure of BiFeOa has been suppressed.
基金Supported by the National Natural Science Foundation of China under Grant No.29401006.
文摘The magnetoresistance(MR)behavior of La_((2-x)/3)Bi_(x/3)Ca_(l/3)MnO_(3)(x=0.4)compound was investigated.The compound exhibits complex magnetic transitions,i.e.,paramagnetic-canted ferromagnetic-ferromagnetic-spin glass transitions.The temperature dependence of resistivity of the compound indicates a semiconducting behavior,and no semiconductor-metal transition was associated with these magnetic transitions.The magnetoresistance ratio exhibits a critical maximum corresponding to the canted ferromagnetic transition.A MR ratio as large as 86%was observed at 85 K.The temperature dependence of MR ratio is well described by the relation of(ρo-ρH)/ρo=A(M/M_(s))^(2).
