Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Characterization and Instrumentation

MA 19.4: Talk

Monday, March 16, 2020, 18:00–18:15, HSZ 101

Scanning thermal gradient microscopy as a tool to read and write domains in non-collinear antiferromagnets — •Helena Reichlova¹, Tomas Janda², Joao Godinho³, Anastasios Markou⁴, Dominik Kriegner⁴, Richard Schlitz¹, Jakub Zelezny³, Zbynek Soban³, Mauricio Bejarano⁵, Helmut Schultheiss⁵, Petr Nemec², Tomas Jungwirth³, Claudia Felser¹, Joerg Wunderlich³, and Sebastian T.B. Goennenwein¹ — ¹Institut für Festkörper- und Materialphysik and Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden — ²Faculty of Mathematics and Physics, Charles University in Prague — ³Institute of Physics, Academy of Science of the Czech Republic — ⁴Max Planck Institute for Chemical Physics of Solids — ⁵Institute of Ion Beam Physics and Materials Research, HZDR

We present scanning thermal gradient microscopy as a tool to visualize magnetic structure in a non-collinear antiferromagnet Mn₃Sn thin films [1]. The technique is based on a laser induced thermal gradient which is scanned over the sample surface. The out-of-plane thermal gradient generates an in-plane thermo-voltage via the anomalous Nernst effect, which depends on the domain orientation and therefore yields magnetic spatial contrast. We further show that a domain pattern can be modified via heat assisted writing. Our work opens a route not only to image domains in non-collinear antiferromagnets but also to prepare well-defined domain configurations. [1] Reichlova, et al., Nat. Comm. 10, 5459 (2019)