Bonn 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

K: Fachverband Kurzzeit- und angewandte Laserphysik

K 6: Poster

K 6.1: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Ultrafast Spectroscopy Reveals Spin-Crossover Behavior in Nanometric Thin Films — •Raluca Denisa Coltuneac¹, Maciej Lorenc², Nicolas Godin², Cristian Enachescu¹, and Laurentiu Stoleriu¹ — ¹Faculty of Physics Alexandru Ioan Cuza University of Iasi, Iasi, Romania — ²Institute of Physics (IPR), Rennes, France

This study examines thermal and spin-crossover (SCO) dynamics in nanometric thin films under laser irradiation. Using[Fe(HB(tz)₃)₂] (tz = 1,2,4−triazol−1−yl) complexes we combine analytical and experimental approaches to explore heat diffusion and SCO transitions.

A Fourier-based heat conduction model incorporates thermal conductivity and laser-induced heating across 2D and 3D geometries, revealing how system shape affects heat dissipation. SCO dynamics were analyzed with femtosecond transient absorption spectroscopy (fs-TAS), tracking spin-state transitions in thermally evaporated thin films on silica. The bistable spin behavior, studied under UV-visible excitation, showed strong links between thermal and light-induced transitions, with spectral control achieved through pump-probe delay adjustments.

These findings advance understanding of nanoscale SCO behavior, offering insights for thermal and optical applications in advanced materials.

Keywords: spin-crossover; laser; pump-probe; heat flow; nanomaterials