Advanced Magnetic Nanostructure Characterization via Resonant Soft X-Ray Spectro Holography Imaging in Combination with Microscopic Hysteresis Loop Analysis

摘要

I will present how to exploit the coherence and tunable polarization of soft X-ray synchrotron radiation for imaging magnetic nanostructures via Fourier Transform Holography [1,2]. This new lens-less imaging technique is based on the direct Fourier inversion of a holographically formed soft X-ray interference pattern. Our implementation is particularly simple and is based on placing the sample behind a lithographically manufactured mask with a micron-sized sample aperture and a nano-sized reference hole as illustrated in Fig.1. The technique avoids costly zone plate X-ray lenses as used in conventional X-ray microscopy. By exploiting the magnetic dichroism in resonance at the L3 edges of the magnetic transition metals (wavelength ～1-2nm (700-900eV), images of magnetic nanostructures have been obtained with a spatial resolution of 50nm. The technique is transferable to a wide variety of specimen, appears scalable to diffraction-limited resolution (about 2nm), and is well suited for ultra-fast single-shot imaging with future X-ray free electron laser sources.