Single scan STEM-EMCD in 3-beam orientation using a quadruple aperture

Ali, Hasan, 1985- (author): Stockholms universitet,Uppsala universitet,Tillämpad materialvetenskap,Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.;Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electrons & Pe, D-52425 Julich, Germany.,Institutionen för material- och miljökemi (MMK)

Sathyanath, Sharath Kumar Manjeshwar (author): Uppsala universitet,Tillämpad materialvetenskap

Tai, Cheuk-Wai, 1973- (author): Stockholms universitet,Avdelningen för oorganisk kemi och strukturkemi,Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.

Rusz, Jan, 1979- (author): Uppsala universitet,Institutionen för fysik och astronomi

Uusimaki, Toni (author): Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.

Hjörvarsson, Björgvin (author): Uppsala universitet,Institutionen för fysik och astronomi

Thersleff, Thomas, 1980- (author): Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.

Leifer, Klaus, 1965- (author): Uppsala universitet,Tillämpad materialvetenskap

(creator_code:org_t)

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Abstract Subject headings

The need to acquire multiple angle-resolved electron energy loss spectra (EELS) is one of the several critical challenges associated with electron magnetic circular dichroism (EMCD) experiments. If the experiments are performed by scanning a nanometer to atomic-sized electron probe on a specific region of a sample, the precision of the local magnetic information extracted from such data highly depends on the accuracy of the spatial registration between multiple scans. For an EMCD experiment in a 3-beam orientation, this means that the same specimen area must be scanned four times while keeping all the experimental conditions same. This is a non-trivial task as there is a high chance of morphological and chemical modification as well as non-systematic local orientation variations of the crystal between the different scans due to beam damage, contamination and spatial drift. In this work, we employ a custom-made quadruple aperture to acquire the four EELS spectra needed for the EMCD analysis in a single electron beam scan, thus removing the above-mentioned complexities. We demonstrate a quantitative EMCD result for a beam convergence angle corresponding to sub-nm probe size and compare the EMCD results for different detector geometries.

By the author/editor: Ali, Hasan, 1985 ...; Sathyanath, Shar ...; Tai, Cheuk-Wai, ...; Rusz, Jan, 1979-; Uusimaki, Toni; Hjörvarsson, Bjö ...; show more...; Thersleff, Thoma ...; Leifer, Klaus, 1 ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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