反钙钛矿结构Fe4N具有高自旋极化率、结构简单、稳定性好、磁化强度高、居里温度高等优点，是自旋注入源的候选材料，在自旋电子器件上具有重要的应用前景。铁电材料0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3(PMN-PT)具有优异的压电性能，是弛豫型铁电材料的研究热点。本项目拟在单晶PMN-PT基底上采用对向靶磁控溅射法制备外延PMN-PT/Fe4N、PMN-PT/Fe4N/IrMn、PMN-PT/Fe4N/MgO/Fe4N(Co40Fe40B20)/IrMn等异质结构；深入研究电场对磁性和输运特性的调控；结合实验与理论，揭示电场对磁各向异性、交换偏置、磁电阻、霍耳效应等调控的物理机制。对外延PMN-PT/Fe4N基异质结构的磁性和输运特性的电场调控及物理机制的深入研究，可丰富对铁磁/铁电异质结构中物理现象的了解与认识，为在磁电双调控的自旋电子学器件上的应用提供实验和理论依据。

The inverse perovskite Fe4N with high spin polarization, simple lattice structure, easy fabrication, high corrosion resisting, high antioxidation, good thermal stability, high saturation magnetization, high Curie temperature, etc is the potential canditate of spin injection sources, which has the important practical applications in the spintronic devices. Ferroelectric 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3(PMN-PT) has good piezoelectric characteristics, which is one of the hot topics in the relaxation ferroelectric materials. In this proposal, we will fabricate the epitaxial PMN-PT/Fe4N, PMN-PT/Fe4N/IrMn, PMN-PT/Fe4N/MgO/Fe4N(Co40Fe40B20)/IrMn heterostructures on single crystal PMN-PT substrates by facing-target magnetron sputtering. The electric field control on the magnetism and electronic transport properties of the PMN-PT/Fe4N based heterostructures will be investigated in details. Based on the experimental and theoretical results, the physical mechanism of magnetoanisotropy, exchange bias, magnetoresistance, Hall effects, etc will be clarified. The results in this project can make the physical phenomena in ferromagnetic/ferroelectric heterostructures clear, which can provide the experimental and theoretical basis for the magneto- and electric-modulated spintronic devices.