Recorded 10 October 2022. Manuel Guizar-Sicairos of the Paul Scherrer Institute presents "Resonant ptychography, applications to 3D magnetization and chemical characterization" at IPAM's Diffractive Imaging with Phase Retrieval Workshop. Abstract: Ptychography is an imaging technique that combines scanning microscopy and coherent diffractive imaging, and is considered today a very promising technique to reach the limits of resolution and sensitivity in X-ray imaging. By measuring 2D ptychograms at different sample orientations the technique can be extended to 3D, i.e. ptychographic X-ray computed tomography (PXCT). While for X-rays we are still far from atomic resolution, X-ray energy resonance offers an alternative way to obtain information about atomic and chemical properties of the sample. I will discuss methods developed in that direction at the Swiss Light Source. With particular applications using X-ray magnetic circular dichroism (XMCD) to map magnetization textures in 3D, and with X-ray spectroscopy for nanoscale 3D chemical characterization of VPO catalyst materials. Learn more online at: http://www.ipam.ucla.edu/programs/workshops/workshop-i-diffractive-imaging-with-phase-retrieval/?tab=schedule