Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5466897 | Ultramicroscopy | 2017 | 6 Pages |
Abstract
The theoretical possibility to use an electron microscope as a spin polarizer is studied. It turns out that a Bessel beam passing a standard magnetic objective lens is intrinsically spin polarized when post-selected on-axis. In the limit of infinitely small detectors, the spin polarisation tends to 100Â %. Increasing the detector size, the polarisation decreases rapidly, dropping below 10â4 for standard settings of medium voltage microscopes. For extremely low voltages, the Figure of Merit increases by two orders of magnitude, approaching that of existing Mott detectors. Our findings may lead to new desings of spin filters, an attractive option in view of its inherent combination with the electron microscope, especially at low voltage.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
P. Schattschneider, V. Grillo, D. Aubry,