Magnetocapacitance in surface-reconstructed LaMnO$_{3}$/SrTiO$_{3}$ multilayers

We report on large magnetocapacitance (MC) effects in LaMnO$_{3}$/SrTiO$_{3}$ multilayer structures. Frequency, temperature and magnetic field dependent dielectric spectroscopy was employed using in-plane and out-of-plane measurement set-ups to investigate multilayers of LaMnO$_{3}$ (15 u.c.) and SrTiO$_{3}$ (2 u.c.) with a repetition rate of 8: (LMO 15/STO 2)$_{8}$. Such multilayer structures have been identified previously to display an electron transfer across the epitaxial interface from LMO to STO, orbital reconstruction and a considerable Ti$^{3+}$ magnetic moment near the LMO/STO interface [Garcia-Barriocanal et al. Adv. Mater. 22 (2010) p.627]. We demonstrate moderate in-plane magnetocapacitance (MC) of up to -5 {\%} associated with an intrinsic magneto-electric coupling (MEC) effect originating from magnetic STO layers. Massive out-of-plane MC of up to -52 {\%} was ascribed to current path changes due to magnetically active STO pin-holes and current path meandering.