TY  - JOUR
AU  - Thersleff, Thomas
AU  - Schönström, Linus
AU  - Tai, Cheuk-Wai
AU  - Adam, Roman
AU  - Bürgler, Daniel E.
AU  - Schneider, Claus M.
AU  - Muto, Shunsuke
AU  - Rusz, Ján
TI  - Single-pass STEM-EMCD on a zone axis using a patterned aperture: progress in experimental and data treatment methods
JO  - Scientific reports
VL  - 9
IS  - 1
SN  - 2045-2322
CY  - [London]
PB  - Macmillan Publishers Limited, part of Springer Nature
M1  - FZJ-2019-06261
SP  - 18170
PY  - 2019
AB  - Measuring magnetic moments in ferromagnetic materials at atomic resolution is theoretically possible using the electron magnetic circular dichroism (EMCD) technique in a (scanning) transmission electron microscope ((S)TEM). However, experimental and data processing hurdles currently hamper the realization of this goal. Experimentally, the sample must be tilted to a zone-axis orientation, yielding a complex distribution of magnetic scattering intensity, and the same sample region must be scanned multiple times with sub-atomic spatial registration necessary at each pass. Furthermore, the weak nature of the EMCD signal requires advanced data processing techniques to reliably detect and quantify the result. In this manuscript, we detail our experimental and data processing progress towards achieving single-pass zone-axis EMCD using a patterned aperture. First, we provide a comprehensive data acquisition and analysis strategy for this and other EMCD experiments that should scale down to atomic resolution experiments. Second, we demonstrate that, at low spatial resolution, promising EMCD candidate signals can be extracted, and that these are sensitive to both crystallographic orientation and momentum transfer.
LB  - PUB:(DE-HGF)16
C6  - pmid:31796786
UR  - <Go to ISI:>//WOS:000500806400001
DO  - DOI:10.1038/s41598-019-53373-1
UR  - https://juser.fz-juelich.de/record/867640
ER  -