Magnetocapacitance effect in perovskite-superlattice based multiferroics

Details Magnetocapacitance effect in perovskite-superlattice based multiferroics Magnetocapacitance effect in perovskite-superlattice based multiferroics

2005-06-14

arxiv.org/abs/cond-mat/0506305v1

Appl. Phys. Lett. 87 (2005) 022505

Physics

Condensed Matter

Materials Science

To be published in Applied Physics Letters

Scientific paper

10.1063/1.1988979

We report the structural and magnetoelectrical properties of La$_{0.7}$Ca$_{0.3}$MnO$_3$/BaTiO$_3$ perovskite superlattices grown on (001)-oriented SrTiO$_3$ by the pulsed laser deposition technique. Magnetic hysteresis loops together with temperature dependent magnetic properties exhibit well-defined coercivity and magnetic transition temperature (T$_C$) \symbol{126}140 K. $DC$ electrical studies of films show that the magnetoresistance (MR) is dependent on the BaTiO$_3$ thickness and negative $MR$ as high as 30% at 100K are observed. The $AC$ electrical studies reveal that the impedance and capacitance in these films vary with the applied magnetic field due to the magnetoelectrical coupling in these structures - a key feature of multiferroics. A negative magnetocapacitance value in the film as high as 3% per tesla at 1kHz and 100K is demonstrated, opening the route for designing novel functional materials.

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