Interfacial Magnetic Response of PbZr$_{0.2}$Ti$_{0.8}$O$_{3}$ /La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ Heterostructures

There is increasing interest in modifying magnetism by electric fields for both scientific and technological point of view. In a ferromagnetic/piezoelectric composite structure, it is reported that the electric field can alter both the Curie temperature and the magnetization in the ferromagnetic material by inducing charge accumulation or depletion at the interface.$^{\mathrm{1}}$ To understand the detailed changes in the magnetization profile at the interface, we performed both polarized neutron reflectivity and resonant soft X-ray reflectivity measurements on an epitaxially grown PbZr$_{\mathrm{0.2}}$Ti$_{\mathrm{0.8}}$O$_{\mathrm{3\thinspace }}$(PZT)/La$_{\mathrm{0.67}}$Sr$_{\mathrm{0.33}}$MnO$_{\mathrm{3}}$ (LSMO) bilayer. A clear magneto-electric effect was observed below the Curie temperature of LSMO; i.e., the magnetization in LSMO decreases when the electric field was applied. The magnetization depth profile as a function of applied electric field will be presented.\\ \\$^{\mathrm{1}}$H. J. A. Molegraaf et al. \textit{Adv. Materials} \textbf{21}, 3470 (2009).\\$^{2}$This work is supported by DOE/BES through grant number DW-SC0003678.