Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 9: Magnetic domain walls

MA 9.9: Vortrag

Montag, 12. März 2018, 17:15–17:30, EB 202

Magnetoelectric Force Microscopy on Antiferromagnetic 180^∘ Domains in Cr₂O₃ — •Marcela Giraldo¹, Peggy Schoenherr¹, Martin Lilienblum¹, Morgan Trassin¹, Dennis Meier², and Manfred Fiebig¹ — ¹ETH Zurich, Switzerland. — ²NTNU, Norway.

Scanning probe microscopy (SPM) techniques constitute the most widely-used characterization tool on the nanoscale. The diversity of operational modes makes them versatile tools with impact in a broad range of fields. SPM techniques proved particularly useful in the investigation of ferroic materials. Even though local ferroic properties have been studied by these techniques, the approach to antiferromagnetic order is almost non-existent. This is regrettable because antiferromagnets are getting increasing attention in recent years. Since antiferromagnets do not exhibit a net magnetization, it is not trivial to access or control them. Efforts aimed at understanding their properties at the domain level are key to their systematic manipulation. In my talk, I will discuss a benchmark experiment and the methodical aspects of a previously proposed SPM technique, termed magnetoelectric force microscopy, as a probe for the elusive type of 180^∘ antiferromagnetic domains in a well known textbook material, Cr₂O₃. Direct comparison by second harmonic generation allows detecting its inherent advantages. I will finally draw your attention on further improvements of the technique which would increase its feasibility to cover most of the known bulk compounds and may even be sufficient to resolve antiferromagnetic domains in type-II multiferroics or magnetoelectric heterostructures.