We report the structural and magnetoelectrical properties of La0.7Ca0.3MnO3/BaTiO3 perovskite superlattices grown on (001)-oriented SrTiO3 by the pulsed laser deposition technique. Magnetic hysteresis loops together with temperature dependent magnetic properties exhibit well-defined coercivity and magnetic transition temperature (TC) \symbol{126}140 K. DC electrical studies of films show that the magnetoresistance (MR) is dependent on the BaTiO3 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.
@article{arxiv.cond-mat/0506305,
title = {Magnetocapacitance effect in perovskite-superlattice based multiferroics},
author = {M. P. Singh and W. Prellier and Ch. Simon and B. Raveau},
journal= {arXiv preprint arXiv:cond-mat/0506305},
year = {2009}
}