Reciprocal and real space maps for EMCD experiments
2010 (English)In: Ultramicroscopy, ISSN 0304-3991, E-ISSN 1879-2723, Vol. 110, no 11, 1380-1389 p.Article in journal (Refereed) Published
Electron magnetic chiral dichroism (EMCD) is an emerging tool for quantitative measurements of magnetic properties using the transmission electron microscope (TEM), with the possibility of nanometer resolution. The geometrical conditions, data treatment and electron gun settings are found to influence the EMCD signal. In this article, particular care is taken to obtain a reliable quantitative measurement of the ratio of orbital to spin magnetic moment using energy filtered diffraction patterns. For this purpose, we describe a method for data treatment, normalization and selection of mirror axis. The experimental results are supported by theoretical simulations based on dynamical diffraction and density functional theory. Special settings of the electron gun, so called telefocus mode, enable a higher intensity of the electron beam, as well as a reduction of the influence from artifacts on the signal. Using these settings, we demonstrate the principle of acquiring real space maps of the EMCD signal. This enables advanced characterization of magnetic materials with superior spatial resolution.
Place, publisher, year, edition, pages
2010. Vol. 110, no 11, 1380-1389 p.
EMCD, magnetic circular dichroism, electron energy-loss spectra, transmission electron microscopy
Physical Sciences Condensed Matter Physics Engineering and Technology
Research subject Engineering Science with specialization in Solid State Physics
IdentifiersURN: urn:nbn:se:uu:diva-108011DOI: 10.1016/j.ultramic.2010.07.004ISI: 000282562100005OAI: oai:DiVA.org:uu-108011DiVA: diva2:233899