外延Fe4N/云母(Mica)柔性异质结构的磁性和输运特性的应力调控

柔性自旋电子学器件具有可卷曲性、便携性、体积小、低能耗等优点，是材料科学、凝聚态物理学和微电子学等领域的研究热点。立方反钙钛矿Fe4N的结构简单、稳定性好、磁化强度高、自旋极化率高、居里温度高，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价值。本项目拟采用对向靶反应溅射法在柔性云母(Mica)基底上制备外延Fe4N薄膜，形成Mica/Fe4N、Mica/Fe4N/NiMn、Mica/Fe4N/Cu/Co(Co40Fe40B20)、Mica/Fe4N/MgO/Co40Fe40B20等柔性异质结构；研究应力对磁性和电输运特性的调控；结合实验与理论，揭示应力对磁各向异性、交换偏置、磁电阻等调控的物理机制。对外延Fe4N基柔性异质结构的磁性和电输运特性的应力调控及物理机制的深入研究，可丰富对柔性磁性薄膜及异质结构中物理现象的了解与认识，为其在柔性自旋电子学器件上的应用提供实验和理论依据。

Flexible spintronics is one of the hot topics in the fields of materials sciece, condensed matter physics and microelectronics because the flexible spintronic devices have the advantages of stretchable characteristic, portability, small size and low energy exhaust, etc. The cubic antiperovskite Fe4N is the potential canditate of spin injection sources due to its simple lattice structure, easy fabrication, high corrosion resistance, high antioxidation, good thermal stability, high saturation magnetization, high spin polarization, high Curie temperature, etc, which has the important practical applications in the spintronic devices. In this proposal, the epitaxial Fe4N films will be fabricated on flexible mica substrates to form the Mica/Fe4N, Mica/Fe4N/NiMn, Mica/Fe4N/Cu/Co(Co40Fe40B20) and Mica/Fe4N/MgO/Co40Fe40B20 flexible heterostructures by facing-target magnetron reactive sputtering. The strain modulation on the magnetic and electronic transport properties of the epitaxial Fe4N films based flexible heterostructures will be investigated in details. Based on the experimental and theoretical results, the physical mechanism of stain tailored magnetic anisotropy, exchange bias, magnetoresistance, Hall effects, etc will be clarified. These results can make the physical phenomena in flexible magnetic films and heterostructures clear, which can provide the experimental and theoretical basis for the practical applications in flexible spintronic devices.