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MA: Fachverband Magnetismus

MA 26: Focus: Towards quantitative magnetic measurements at ultimate spatial resolution with electrons

MA 26.1: Invited Talk

Wednesday, March 18, 2015, 09:30–10:00, EB 202

Magnetic measurements at high resolution in an electron microscope: a review. — •Josef Zweck — University of Regensburg, 93040 Regensburg, Germany

This talk will introduce the various techniques which are today available in an electron microscope to yield highly resolved information of magnetic specimens.

While high resolution is usually associated with "high spatial resolution", this is nowadays only one aspect of (magnetic) electron microscopy, and certainly an important one. Beyond spatial resolution, and upon the advent of quantitative magnetic imaging, the second flavour of "high resolution", namely highly resolved measurements of local magnetic information, becomes more and more important.

Magnetic imaging in a TEM originated from the so-called Lorentz microscopy, which gave easy access to micromagnetic configurations on a local scale. It is tuneable in sensitivity, but suffers from being strongly non-linear. It is now complemented by other techniques such as electron holography, differential phase contrast (DPC) and the TIE reconstruction method which allow to exploit both meanings of "high resolution" at the same time.

The techniques will be presented, highlighting their specific advantages and disadvantages, examples of their use will be given.