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DTSTART;TZID=Europe/Berlin:20251217T160000
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DTSTAMP:20260424T160647
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UID:6231-1765987200-1765990800@www.trr360.de
SUMMARY:TRR 360 Seminar:Multiferroic conversionTsuyoshi Kimura
DESCRIPTION:Multiferroic conversion\n \nProf. Dr. Tsuyoshi Kimura \nDepartment of Applied Physics\, University of Tokyo\, Japan \n\n\n\n\n\n\nSymmetry breaking ascribed to the evolution of an order parameter is one of the most important concepts in materials physics. Representative examples are symmetry breakings in ferroic materials\, such as the symmetry breaking of time reversal in ferro-magnets and that of space inversion in ferroelectrics. Recent research developments of multiferroic materials have triggered extensive studies on unconventional ferroic materials such as ferro-toroidic\, ferro-axial\, and ferro-chiral materials. \n\n\n\nIn this presentation\, we propose the concept of “multiferroic conversion”\, which refers to the transformations of ferroic states by combining different ferroic orders. Such conversion occurs\, for example\, by a deformation of a structural unit in a ferroic material [1] and by the application of external stimuli such as an electric field to a ferroic material [2-5]. We demonstrate several types of multiferroic conversion by observing unconventional optical phenomena\, including electric-field-included Faraday effect (from ferro-magnetic-monopolar to ferro-magnetic state) [2]\, electrogyration (ferro-axial to ferro-chiral) [3]\, magneto-chiral dichroism (ferro-axial to ferro-magnetic-toroidal) [4]\, and electric-field-induced nonreciprocal directional dichroism (altermagnetic to ferro-magnetic-toroidal) [5]. The concept of multiferroic conversion will lead to the unconventional functionalities of various ferroic materials. \n\n\n\n \n\n\n\n[1] T. Nagai et al.\, J. Am. Chem. Soc. 146\, 23348 (2024).[2] T. Hayashida et al.\, Phys. Rev. Research 4\, 043063 (2022).[3] T. Hayashida et al.\, Nat. Commun. 11\, 4582 (2020).[4] T. Hayashida et al.\, Proc. Natl. Acad. Sci. 120\, e2303251120 (2023).[5] T. Hayashida et al.\, Adv. Mater. 37\, 241876 (2025). \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminarmultiferroic-conversiontsuyoshi-kimura/
LOCATION:University of Augsburg\, Room 242-R
CATEGORIES:Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260428T160000
DTEND;TZID=Europe/Berlin:20260428T170000
DTSTAMP:20260424T160647
CREATED:20260323T110840Z
LAST-MODIFIED:20260422T115941Z
UID:6549-1777392000-1777395600@www.trr360.de
SUMMARY:TRR 360 Seminar:From solitons to correlations: Non-equilibrium spin dynamics across multiple scales Lukas Körber
DESCRIPTION:From solitons to correlations: Non-equilibrium spin dynamics across multiple scales\n \nDr. Lukas Körber \nUltrafast Spectroscopy of Correlated Materials\, Radboud University\, Nijmegen\, Netherlands \n\n\n\n\n\n\nAlthough magnetism fundamentally arises from complex quantum many-body interactions\, it is often possible to describe phenomena in ordered materials using classical emergent frameworks at various length and energy scales. This perspective facilitates the analysis of a wide range of static and dynamic nonlinear phenomena\, including topological solitons\, spin textures\, parametric resonance\, ultrafast switching\, auto-oscillations\, and chaos. Typically\, each emergent level is achieved by coarse-graining microscopic details\, which provides predictive power and introduces new conceptual tools\, such as torques\, conserved topological charges\, and solitons. However\, when magnetic systems are driven far from equilibrium\, this established hierarchy of emergent descriptions can break down\, resulting in fundamentally new multiscale effects that challenge existing conceptual frameworks. \n\n\n\n \n\n\n\nIn this talk\, I will present three complementary mechanisms that exemplify this breakdown from distinct perspectives. First\, driving a topological soliton with high-frequency microwave radiation can push the magnetic system into a far-from-equilibrium state where slow soliton dynamics and fast magnon dynamics become strongly coupled\, resulting in self-induced Floquet modes [1]. Second\, strong laser excitation of chiral magnets can induce significant thermal fluctuations\, resulting in the ultrafast nucleation of solitons known as skyrmions. While the skyrmion number is typically considered conserved at the emergent level\, in the ultrafast regime\, their collective dynamics can be described by independent thermally activated nucleation and annihilation events [2]. Lastly\, at even shorter spatiotemporal scales\, perturbing antiferromagnets can drive them into strongly excited states where classical nonlinear magnetism fails\, and quantum correlations become significant. Although numerical quantum many-body techniques can capture certain nonlinear spin dynamics\, these methods are computationally intensive and often obscure the connection between nonlinear dynamics and their geometric origin in the angular-momentum algebra of spins. To address this challenge\, we propose a semiclassical spin-correlation theory that evolves spin correlations on lattice bonds rather than on individual spins [3]. This approach incorporates nonlinear dynamics beyond classical models while preserving the geometric structure associated with the intrinsic nonlinearity of spins.[1] Heins\, Körber et al.\, Science 391\, 6781pp. 190-194 (2026)\, DOI: 10.1126/science.adq9891[2] Lieferink\, Körber et al.\, PRL 136\, 146705 (2026)\, DOI: 10.1103/brnt-2m9l[3] Körber et al. (2025)\, arXiv:2512.11466 \n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartbdlukas-korber/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260714T160000
DTEND;TZID=Europe/Berlin:20260714T170000
DTSTAMP:20260424T160647
CREATED:20260323T111434Z
LAST-MODIFIED:20260323T161034Z
UID:6553-1784044800-1784048400@www.trr360.de
SUMMARY:TRR 360 Seminar:tbdMathias Kläui
DESCRIPTION:tbd\n \nProf. Dr. Mathias Kläui \nInstitute of Physics\, University of Mainz \n\n\n\n\n\n\n \n\n\n\n \n\n\n\ntbd \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartbdmathias-klaui/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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