Watching magnetic atoms through the electron microscope

  • Date: –14:15
  • Location: Ångströmlaboratoriet, Lägerhyddsvägen 1 Häggsalen (Å10132, ground floor, house 1)
  • Lecturer: Dr. Ján Rusz
  • Organiser: Department of Physics and Astronomy
  • Contact person: Jan Rusz
  • Phone: 018 471 5844
  • Docentföreläsning

Department of Physics and Astronomy hereby invites all interested to a docent lecture on the subject of Physics.

Lecturer: Dr. Ján Rusz

Title: “Watching magnetic atoms through the electron microscope”

Chairman: Prof. Peter M. Oppeneer

Docent representative: Prof. Stephan Pomp

 

The lecture will be given in English.

 

Abstract: Transmission electron microscope is a versatile scientific instrument. It utilizes accelerated electrons to pass through a sample and an array of detectors to observe a wide range of scattering processes. Accelerated electrons in a typical transmission electron microscope have their de Broglie wavelength in the picometer range, which should allow observing individual atoms. This was one of the initial motivations to develop an electron microscope, since 1931. Yet, unavoidable aberrations of rotationally symmetric electromagnetic lens meant that sub-Ångström resolution had to wait until so called aberration correctors have been developed. That quest took about 50 years. Today, achieving atomic resolution is a routine task in an aberration corrected transmission electron microscope. It is possible to observe individual atomic columns via electrons that have been scattered elastically or inelastically, to observe spectra of individual atoms revealing information about local chemistry, to detect projected microscopic electric fields or atomic potentials, to observe emitted x-rays and recently atomic resolution has been achieved also in vibrational spectroscopy. One of the ongoing quests in electron microscopy is to add to this already wide repertoire also a measurement of magnetism with atomic resolution.

The lecture, which is a teaching test for those who applied to be admitted as an associate professor, will be followed by students and others with knowledge at undergraduate level in the subject, but may also be of interest to a wider audience. The lecture lasts 45 minutes for questions and discussion and will be given in English.

Welcome!

 

Ján Rusz
Materials Theory Division
Department of Physics and Astronomy
Ångström Laboratory
Uppsala University
Sweden
Tel: +46 (0) 18 471 5844