SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Magnetic Domain Walls (non-skyrmionic)

MA 50.7: Vortrag

Freitag, 31. März 2023, 11:00–11:15, POT 6

Visualisation of an 4f-antiferromagnetic domain pattern in multiferroic Dy0.7Tb0.3FeO3 — •Yannik Zemp1, Mads C. Weber1,2, Ehsan Hassanpour1,3, Thomas Lottermoser1, Yusuke Tokunaga4, Yasujiro Taguchi5, Yoshinori Tokura5,6, and Manfred Fiebig11Department of Materials, ETH Zurich — 2IMMM, Le Mans Université — 3UDEM Inselspital, University of Bern — 4Department of Advanced Materials Science, University of Tokyo — 5RIKEN CEMS, Japan — 6Department of Applied Physics, University of Tokyo

We visualize the antiferromagnetic (AFM) domain pattern of the 4f-rare-earth subsystem in Dy0.7Tb0.3FeO3. To do so, we exploit the unique order-parameter interaction in the multiferroic phase of this material, where the magnetic rare-earth- and iron subsystems induce ferroelectricity. By magnetic-field cooling into the multiferroic phase, we force the 4f-rare-earth- and ferroelectric domain pattern to be identical. We can then access the former by imaging the latter using optical second harmonic generation, which is very sensitive to a breaking of inversion symmetry. The 4f-AFM domains form stripes with a thickness of several 10 µm along the antiferromagnetic easy axis. As a consequence, the ferroelectric domains are forced to form energetically unfavourable head-to-head and tail-to-tail domain walls. Also, the domain pattern is very dissimilar to the weakly ferromagnetic bubble-domain structure of the iron sublattice that is present at higher temperatures. These observations show that the rare-earth system orders independently from the other magnetic- and electric influences.

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