Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 18: Magnetic Imaging and Sensors I
MA 18.11: Talk
Tuesday, March 19, 2024, 12:15–12:30, EB 301
Opto-electrical approach to resolve magnetic nanostructures in ferromagnetic and antiferromagnetic thin films — •Atul Pandey1,2, Jitul Deka1, James m Taylor2, Stuart s p Parkin1, and Georg Woltersdorf1,2 — 1Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany — 2Institute of Physics, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle, Germany
We present an opto-electrical approach based on the anomalous Nernst effect (ANE) to image magnetic domain structures. For this, a focused laser beam creates a temperature gradient and the voltage due to ANE is detected. As this voltage is proportional to magnetization, a spatially-resolved measurement allows to image the domain structures and characterize magnetic properties. The spatial resolution in such an experiment is given by diffraction limited spot size of the focused laser beam, which is on the order of 300 nm for a green laser. A near-field optical microscope is utilized to make the improvement. This allows us to obtanin the resolution of 10s of nm. Traditional techniques for imaging magnetic domains rely on coupling of magnetic stray fields. Therefore, it is challenging to image domain structures in antiferromagnet due to their relatively small stray fields. Since ANE in antiferromagnets is a Berry curvature driven effect, our technique can also be used to image magnetic domains in antiferromagnets.
Keywords: chiral antiferromagnets; Nernst effect; magnetic domains; SNOM; imaging