Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Focus Session: Chiral phonons and crystals coupled to magnetic order I
MA 25.6: Vortrag
Mittwoch, 11. März 2026, 11:45–12:00, HSZ/0002
Associated magnetism of circular ionic motion probed with ultrafast x-ray pulses — •Clifford Allington1, Matthew Lutz2, E. Ho2, F. Graf3, M. Basini3, H. Ueda2, A. Elliot2, M. Biggs2, R. Finn2, S-W Huang1, M. Grimes1, M. Henstridge4, M. Hoffmann4, R. Alonso-Mori4, D. Zhu4, Q. Nguyen4, V. Esposito4, T. Sato4, E. Skoropota1, E. Paris1, A. Camps1, E. Razzoli1, R. Mankowsky1, F. Capotondi5, N. Jaouen6, M. Radovic1, M. Savoini1,3, E. Abreu3, S. Johnson1,3, Jeremy Johnson2, and Urs Staub1 — 1Paul Scherrer Institute — 2Brigham Young University — 3ETH Zurich — 4SLAC National Accelerator Laboratory — 5Elettra Sincrotrone Trieste — 6Synchrotron SOLEIL
It has been proposed that the coherent circular motion of ions creates a magnetic field. This effect, termed dynamical multiferroicity (DM), has been evidenced experimentally in diamagnetic materials such as SrTiO3 using circular terahertz (THz)-pump optical-probe methodologies. However, the fields reported are much larger than predicted, raising questions on the exact nature of the transient state. Thus, we performed a suite of circular THz-pump experiments on the paramagnetic EuTiO3, a material directly analogous to SrTiO3 but with a S = 7/2 spin on the Eu2+ ion. We have measured the circular motion of ions by femtosecond x-ray diffraction as well as an optical-probe signal which changes sign upon changing the helicity of the THz-pump, consistent with DM. However, no induced Eu2+ moment was found within the resolution of time-resolved x-ray magnetic circular dichroism, providing a quantitative upper limit on the resulting field.
Keywords: Dynamical Multiferroicity; Terahertz; X-rays; Ultrafast; Phonomagnetism