Berlin 2024 – wissenschaftliches Programm
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SYSA: Symposium Synergistic Imaging Techniques: From Spins and Atoms to Ferroic Domains
SYSA 1: Synergistic Imaging Techniques: From Spins and Atoms to Ferroic Domains
SYSA 1.4: Hauptvortrag
Montag, 18. März 2024, 16:45–17:15, H 0105
Imaging probe nuclei environments using perturbed angular correlation spectroscopy: Examples from multiferroic BiFeO3 — •Doru C. Lupascu1, Thien Thanh Dang1,2, Georg Marschick3, Marianela Escobar1, Astita Dubey1, Ian Yap Chang Jie1,2, and Juliana Heiniger-Schell1,2 — 1Institute for Materials Science and CENIDE, University of Duisburg-Essen — 2CERN, Geneva, Switzerland — 3X-Ray Center, Vienna University of Technology, Austria
Bismuth ferrite is our Drosophila system for multiferroicity at room temperature. In this presentation it is shown that decoupling of the magnetic and electric orders happens fundamentally at the unit cell level. Antiferromagnetism and cycloidal ordering of the Dzyaloshinskii-Moriya interaction generated magnetic moments are not necessary to be considered for explaining the low coupling. Our data from a nuclear solid state technique show that the magneto-electric coupling in the magnetic sub-lattice is actually enormous. The oxygen octahedral around the iron site experience a large tilt due to the onset of magnetic ordering. The Bi-containing complementary sub-lattice nevertheless is practically unaffected by this large structural change in its direct vicinity. Relation to classical magnetoelectric coupling schemes are drawn. The second part of the presentation will then deal with applications of this knowledge to the tuning of magnetic, electric and photon interaction properties in custom designed nanoparticles. Photocatalytic applications, hyperthermia treatment and net magnetization studies will be shown for nanoparticles differently doped on the two sub-lattices tuning strain and magnetic coupling. Surface effects will be considered.
Keywords: BiFeO3; Multiferroic; Hyperfine Interaction