论文标题
NDFEO3外延薄膜中磁各向异性和磁矩的应变工程
Strain engineering of the magnetic anisotropy and magnetic moment in NdFeO3 epitaxial thin films
论文作者
论文摘要
应变工程是调整ABO3钙钛矿氧化薄膜的各种功能的强大均值。稀土原氧rfeo3材料（例如NDFEO3（NFO））引起了人们的主要关注，因为它们具有吸引人的磁性及其技术潜在应用，尤其是作为薄膜。在这里，使用大量的互补和高级技术，我们表明，NFO外延薄膜成功地通过脉冲激光沉积（001）-SRTIO3在（001）-SRTIO3上成功生长，在54 nm的关键厚度TC以下显示出强的磁各向异性，与与对称模式相关的结构性修饰和对称性变化的发生相关联。通过通过TC以下膜厚度的降低来改变拉伸失配应变，可以连续调谐面内和脱落磁化的幅度，同时它们的比率保持恒定。此外，紧张和松弛的膜证明了不同的低温磁性行为，这表明应变诱导的结构状态会影响磁相稳定性。
Strain engineering is a powerful mean for tuning the various functionalities of ABO3 perovskite oxide thin films. Rare-earth orthoferrite RFeO3 materials such as NdFeO3 (NFO) are of prime interest because of their intriguing magnetic properties as well as their technological potential applications especially as thin films. Here, using a large set of complementary and advanced techniques, we show that NFO epitaxial thin films, successfully grown by pulsed laser deposition on (001)-SrTiO3, show a strong magnetic anisotropy below a critical thickness tc of 54 nm, associated with the occurrence of structural modifications related to symmetry and domain pattern changes. By varying the tensile misfit strain through the decrease of film thickness below tc, the amplitudes of in and out-of-plane magnetization can be continuously tuned while their ratio stays constant. Furthermore, different low-temperature magnetic behaviors are evidenced for strained and relaxed films, suggesting that the strain-induced structural state impacts the magnetic phase stability.
