Magnetic circular dichroism in EELS: Towards 10 nm resolution

作者：Schattschneider Peter; Hebert Cecile; Rubino Stefano^*; Stoeger Pollach Michael; Rusz Jan; Novak Pavel

来源：Ultramicroscopy, 2008, 108(5): 433-438.

DOI：10.1016/j.ultramic.2007.07.002

• magnetic dichroism
• electron energy loss spectroscopy
• coherence

We describe a new experimental setup for the detection of magnetic circular dichroism with fast electrons (EMCD). As compared to earlier findings the signal is an order of magnitude higher, while the probed area could be significantly reduced, allowing a spatial resolution of better than 40 nm. A simplified analysis of the experimental results is based on the decomposition of the mixed dynamic form factor S((q) over right arrow, (q) over right arrow', E) into a real part related to the scalar product and an imaginary part related to the vector product of the scattering vectors (q) over right arrow and (q) over right arrow'. Following the recent detection of chiral electronic transitions in the electron microscope the present experiment is a crucial demonstration of the potential of EMCD for nanoscale investigations.

• 出版日期2008-4