Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 3: Complex Magnetic Oxides
MA 3.11: Talk
Monday, March 9, 2026, 12:15–12:30, POT/0112
EMCD analysis of ferrimagnetic moments changes in Ti-doped barium hexaferrite — •Hitoshi Makino1, Rolf Erni2, Devendra Singh Negi3, Ján Rusz4, Bernd Rellinghaus1, and Darius Pohl1 — 1DCN, TU Dresden, Dresden, Germany — 2Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland — 3Indian Institute of Technology Jodhpur, Jodhpur, India — 4Uppsala University, Uppsala, Sweden
Barium hexaferrite (BaFe12O19) is a robust permanent magnet material with good thermal and environmental stability. Small substitutions of Fe by Ti are known to enhance the coercivity at elevated temperatures. Our goal is to reveal changes of the ferrimagnetic arrangement of the moments by the Ti doping using electron energy-loss magnetic chiral dichroism (EMCD), an element- and site-specific probe of magnetic moments via electron energy-loss spectroscopy (EELS). We modified a highly accurate classical EMCD methodology with an improved signal-to-noise ratio, enabling the quantitative deconvolution of the Fe-L2,3 edges into oxidation- and site-resolved magnetic contributions. The results suggest that the magnetic structure changes primarily at the tetrahedral site. Using the recently established atomic-resolution electron vortex beam EMCD, we verified these results from an alternative perspective. These measurements reveal a threefold supersymmetry in the magnetic-moments, consistent with the symmetry of the site occupied by Ti substitution identified in the STEM-EELS elemental map. These observations deepen our understanding of magnetic structure changes induced by Ti doping in barium hexaferrite.
Keywords: Barium hexaferrite; S/TEM; EELS; EMCD; Electron Vortex Beam