Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.58: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-EG

DPC measurements of local hysteresis loops on annealed cobalt thin films — •Felix Schwarzhuber, Thomas Beer, and Josef Zweck — Institute for Experimental and Applied Physics, University of Regensburg, Germany

Differential Phase Contrast Microscopy (DPC) in a Scanning Transmission Electron Microscope allows us to obtain detailed information about microscopic distributions of the magnetic induction within a specimen.

In this work we performed DPC tilting series on 50 nm thick annealed cobalt thin films to gather information about their magnetic properties. By tilting the specimen relative to the magnetic field of the objective lens we change the effective in-plane field acting on our samples, leading to a change of the in-plane induction distribution in our cobalt thin films. This change can be imaged in detail with our DPC setup. As we investigate a small area of the specimen (few microns square) we are able to measure local magnetic hysteresis effects. The obtained hysteresis loops and DPC images let us clearly distinguish whether the remagnetization processes included a vortex core or not. In addition, we are also able to observe pinning of magnetic features on larger cobalt crystallites.