Rotation of electron beams in the presence of localised, longitudinal magnetic fields

Electron Bessel beams have been generated by inserting an annular aperture in the illumination system of a TEM. These beams have passed through a localised magnetic field. As a result a low amount of image rotation (which is expected to be proportional to the longitudinal component of the magnetic field) is observed in the far field. A measure of this rotation should give access to the magneti field. The two datasets have been acquired in a FEI Titan3 microscope, operated at 300kV. The file focal_series.tif contains a series of images acquired varying the magnetic field through the objective lens. The file line_profile.ser contains a series of images acquired by scanning the beam over a sample with several magnetised nanopillars. For reference, check the associated publication: Giulio Guzzinati, Armand Béché, Damien McGrouther and Jo Verbeeck, Prospects for out-of-plane magnetic field measurements through interference of electron vortex modes in the TEM, Journal of Optics 21 124002 (2019