Designing magnetism and electronic properties in Sr-based high-entropy oxide perovskite thin films

It is the goal of this project to shed light into Sr-based high-entropy oxide perovskite thin films via element-sensitive XMCD/XMLD spectroscopy. Using pulsed laser deposition (PLD), we will grow a variety of Sr(5B)O3 thin film on SrTiO3 (STO) (001) substrates. Following film growth and macroscopic magnetic characterization via SQUID magnetometry, the samples will undergo a full-scale temperature-dependent x-ray absorption spectroscopy (XAS) study, employing both x-ray magnetic circular and linear dichroism (XMCD and XMLD) at the L2,3 edges of all five transition metals within a given 5B-block. In addition, XMCD hysteresis loops at the L3 edges will allow us to further characterize the evolution of the ferromagnetic response, as the composition within the 5B block is varied, on an element-by-element basis.

本项目旨在借助元素敏感型X射线磁圆二色谱（XMCD）/X射线磁线性二色谱（XMLD）光谱技术，阐明锶基高熵氧化物钙钛矿薄膜的相关特性。我们将采用脉冲激光沉积（pulsed laser deposition, PLD）技术，在钛酸锶（SrTiO3, STO）(001)晶向衬底上生长一系列Sr(5B)O3薄膜。完成薄膜生长与基于超导量子干涉仪（SQUID）磁测法的宏观磁表征后，我们将对样品开展全面的温度依赖型X射线吸收光谱（X-ray absorption spectroscopy, XAS）研究，在给定5B区块内全部5种过渡金属的L2,3边处，同时运用X射线磁圆二色谱与X射线磁线性二色谱技术。此外，通过采集L3边处的XMCD磁滞回线，我们能够逐元素地表征当5B区块内组分发生变化时铁磁响应的演化规律。