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Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):

P. Schattschneider:
"Magnetic chirality in the electron microscope: Progress and Applications";
Vortrag: DPG Spring Meeting 2010 of the Condensed Matter Section, Regensburg (eingeladen); 21.03.2010 - 26.03.2010; in: "Verhandlungen der Deutschen Physikalischen Gesellschaft", Deutsche Physikalische Gesellschaft, 3 (2010), ISSN: 0420-0195; S. 440.



Kurzfassung englisch:
Via the electron-electron interaction it can be shown everything that
can be done in a synchrotron is also feasible in an electron microscope.
In practice, however, electron and photon probes behave differently. In
this respect, the EMCD technique (energy loss magnetic chiral dichroism)
in the electron microscope [1] - the equivalent of the synchrotron
based XMCD, a standard technique for the study of atom specific magnetism
- has the intrinsic advantage of high spatial resolution. The
main difficulty with EMCD is the low signal intensity, asking for exposure
times of the order of minutes, and very particular scattering
conditions necessary to observe a chiral dichroic signal. Nevertheless,
much progress was made in the last years. EMCD has evolved into
several techniques, now utilising either energy filtering, spectroscopy,
TEM or STEM conditions. After a synopsis of the present situation in
EMCD, recent results such as nanometric resolution, the applicability
of XMCD sum rules, and new image simulation software are discussed.
The observation that chiral electronic transitions break certain mirror
symmetries in energy spectroscopic diffraction (ESD) led to the prediction
that this chirality pertains in energy filtered high resolution
imaging, thus opening a road to mapping electron spins of individual
atomic columns under HR-TEM conditions. [1] P. Schattschneider et al., Nature. 441 (2006), 486


Elektronische Version der Publikation:
http://publik.tuwien.ac.at/files/PubDat_185262.pdf


Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.