Prediction of perovskite and other ternary oxide multilayers as mirrors for soft X-rays

Publication date: February 2018 Source:Materials Research Bulletin, Volume 98 Author(s): Kaihang Luo, Shanyuan Niu, Dhyey Shah, Amogh Lonkar, Yang Liu, Jayakanth Ravichandran We propose multilayers of perovskite and related ternary oxides with a general formula of ABO3 as high reflectivity mirrors, especially for use in water window region (2.3–4.4nm). The high reflectivity combinations of oxide multilayers were deduced using evolutionary search algorithms such as genetic algorithms, and the calculation speed was accelerated via parallel computing methods We also propose a figure of merit for X-ray reflectivity in periodic multilayers systems, which can simplify the future efforts on identifying material combinations, and the search through this multi-dimensional parameter space. The highest reflectivity value was found to be over 33% at 3.1nm in the water window region. The effect of interface roughness was simulated and the decrease in reflectivity was found to be modest for practically achievable roughness values. This work establishes the foundation for future experimental and theoretical studies towards achieving high reflectivity x-ray mirrors of complex oxide multilayers. Graphical abstract
Source: Materials Research Bulletin - Category: Materials Science Source Type: research