论文标题
垂直排列的LA0.7SR0.3MNO3的合成和表征：用于旋转的Nio纳米复合薄膜
Synthesis and characterization of vertically aligned La0.7Sr0.3MnO3:NiO nanocomposite thin films for spintronic applications
论文作者
论文摘要
两相垂直排列的纳米复合材料（VAN）薄膜的微结构和界面在Spintronic设备体系结构及其多功能属性的设计中起着关键作用。在这里，我们展示了LA0.7SR0.3MNO3：Nio（LSMO：NIO）的自组装货车薄膜中的微观结构如何从纳米粒状到纳米柱的纳米 - 柱剂，以及通过控制两个组成型量的puls puls pulsed lassed lassed lassed las las las las laste las las las las las las las las las las las las las las las las las las las las las las las las las las las las las las las las las s in nano-maze的有效调整。发现观察到的微观结构诱导应变可显着增强在10-240 K之间非常宽的温度范围内的磁磁性，并调节平面内交换偏置（EB），并且在最大性异质结构中观察到的EB值最大。最有趣的是，对于这些异质结构，具有增强的PEB场的独特垂直交换偏置（PEB）效应，最高可达230 OE。 X射线磁性圆形二色性和训练效果测量表明，观察到的EB是无序引起的，并且由于Nio无偿矩固定在无序界面上的固定而产生，该界面与LSMO在铁磁上耦合。此外，由于平面外拉伸应变而出现了与MN3+/MN4+含量变化有关的垂直界面的电子结构的系统变化。
The microstructures and interfaces of two-phase vertically aligned nanocomposite (VAN) thin films play a key role in the design of spintronic device architectures and their multifunctional properties. Here, we show how the microstructures in self-assembled VAN thin films of La0.7Sr0.3MnO3:NiO (LSMO:NiO) can be effectively tuned from nano-granular to nano-columnar, and to nano-maze by controlling the number of laser shots from the two constituent phase targets in the pulsed laser deposition (PLD) film growth. The observed microstructural induced strain is found to significantly enhance the magnetoresistance in a very broad temperature range between 10-240 K and to modulate the in-plane exchange bias (EB), with the largest EB value observed in the maximally strained heterostructures. Most interestingly, a unique perpendicular exchange bias (PEB) effect is also observed for these heterostructures with an enhanced PEB field of up to 230 Oe. X-ray magnetic circular dichroism and training effect measurements demonstrate that the observed EB is disorder-induced and arises due to the pinning of NiO uncompensated moments at the disordered interface which is ferromagnetically coupled with LSMO. Furthermore, systematic changes in the electronic structure across the vertical interface related to a variation of the Mn3+/Mn4+ content arise as a consequence of out-of-plane tensile strain.
