Hard X-ray polarizer to enable simultaneous three-dimensional nanoscale imaging of magnetic structure and lattice strain

详细信息    查看全文

• 作者：Jonathan Logan ; Ross Harder ; Luxi Li ; Daniel Haskel ; Pice Chen ; Robert Winarski ; Peter Fuesz ; Deborah Schlagel ; David Vine ; Christa Benson and Ian McNulty
• 关键词：Bragg coherent diffractive imaging ; XMCD ; nanomagnetism ; strain
• 刊名：Journal of Synchrotron Radiation
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：23
• 期：5
• 页码：1210-1215
• 全文大小：725K
• ISSN：1600-5775

文摘

Recent progress in the development of dichroic Bragg coherent diffractive imaging, a new technique for simultaneous three-dimensional imaging of strain and magnetization at the nanoscale, is reported. This progress includes the installation of a diamond X-ray phase retarder at beamline 34-ID-C of the Advanced Photon Source. The performance of the phase retarder for tuning X-ray polarization is demonstrated with temperature-dependent X-ray magnetic circular dichroism measurements on a gadolinium foil in transmission and on a Gd₅Si₂Ge₂ crystal in diffraction geometry with a partially coherent, focused X-ray beam. Feasibility tests for dichroic Bragg coherent diffractive imaging are presented. These tests include (1) using conventional Bragg coherent diffractive imaging to determine whether the phase retarder introduces aberrations using a nonmagnetic gold nanocrystal as a control sample, and (2) collecting coherent diffraction patterns of a magnetic Gd₅Si₂Ge₂ nanocrystal with left- and right-circularly polarized X-rays. Future applications of dichroic Bragg coherent diffractive imaging for the correlation of strain and lattice defects with magnetic ordering and inhomogeneities are considered.