Abstract
A colossal magnetocapacitance in magnetic fields was observed near the Curie temperature Tc=220K of La5/8Ca3/8MnO3 for the BiFeO3/La5/8Ca3/8MnO3 epitaxial film. It was found that the magnetocapacitance increases with increasing magnetic fields and reaches a maximum up to 1100% enhancement around Tc at 10T. From the analysis of the dielectric relaxation, one can see that the behavior of relaxation time τ above Tc differs from that below Tc, and the value of τ decreases with increasing magnetic fields. This colossal magnetocapacitance effect near room temperature in BiFeO3/La5/8Ca3/8MnO3 may have potential applications in multifunctional microelectronic device.
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