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XRD profile of the BFO/LSMO heterostructure on STO (001) substrate.
The frequency dependence of the capacitance of the In/BFO/LSMO capacitor under forward biases. The inset shows the characteristics of the In/BFO/LSMO capacitor at and . The ac oscillation voltage was .
(a) Complex impedance spectra of the In/BFO/LSMO capacitor under different dc biases, the vertical line shows the demarking frequency where the polarization changed from interfacial polarization to bulk polarization. The solid lines through the date points are the fitting results obtained by a series of three parallel circuits. (b) Representation of vs for the complex impedance spectrum under zero bias; the inset displays the equivalent fitting circuit.
Fitting parameters of Fig. 3(a) using the equivalent circuit shown in the inset of Fig. 3(b), where , describe the In/BFO interface, , describe the BFO/LSMO interface, and , describe the bulk.
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