Dichroic Bragg Diffraction Imaging

The proposed experiment aims to develop and test Dichroic Bragg Coherent Diffraction Imaging (DBCDI), an underutilized technique for magnetic nanostructure characterisation. Bragg Coherent Diffraction Imaging (BCDI) has proven valuable for structural characterisation of various nanostruc-tures, particularly in energy materials and, to a lesser extent, semiconductors. While BCDI has been applied to magnetic materials, prior studies have been limited by reconstruction algorithm constraints.
This experiment will characterise magnetised NiFe nanoparticles using BCDI with X-ray beams tuned to element-specific K edges and different incident polarisations, enabled by the integrated diamond phase plate polarisers at beamline ID01. The primary goal is to demonstrate the feasibility of DBCDI for magnetic characterisation. Once established, the technique will enable combined structural and magnetic studies of nanostructures.

本研究提出的实验旨在开发并测试二向色性布拉格相干衍射成像（Dichroic Bragg Coherent Diffraction Imaging，DBCDI）——一种尚未得到充分利用的磁性纳米结构表征技术。布拉格相干衍射成像（Bragg Coherent Diffraction Imaging，BCDI）已被证实对多种纳米结构的结构表征具有重要价值，尤其在能源材料领域应用广泛，而在半导体领域的应用则相对有限。尽管BCDI已被应用于磁性材料的表征，但此前的相关研究均受限于重建算法的约束。
本实验将借助光束线ID01处集成的金刚石相位板偏振器，使用调谐至元素特征K边、入射偏振态各异的X射线束，通过BCDI技术对磁化镍铁纳米颗粒进行表征。本研究的首要目标是验证DBCDI用于磁性表征的可行性。该技术一旦得以确立，将可实现纳米结构的结构与磁性联合表征。