Colossal magnetocapacitance effect in BiFeO3/La5/8Ca3/8MnO3 epitaxial films

A colossal magnetocapacitance in magnetic fields was observed near the Curie temperature Tc = 220 K 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 10 T. 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.

► BiFeO3/La5/8Ca3/8MnO3 epitaxial films show well ferroelectric properties.
► A colossal magnetocapacitance effect up to 1100% at 10 T near room temperature.
► The relaxation process above the Curie temperature Tc differs from that below Tc.