Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Ultrafast Magnetization Effects II
MA 38.9: Talk
Wednesday, March 11, 2026, 17:15–17:30, POT/0361
Large strain contribution to the laser-driven magnetization response of magnetostrictive TbFe2 — •Constantin Walz1, Fried-C. Weber1,2, Steffen-P. Zeuschner1, Karine Dumesnil3, Alexander von Reppert1, and Matias Bargheer1,2 — 1Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — 2Helmholtz-Zentrum Berlin, Berlin, Germany — 3Institut Jean Lamour, Université de Lorraine, Nancy, France
Rare Earth-Iron compounds (REFe2 with RE = Tb, Dy, Tb0.3Dy0.7) are well known for their giant (inverse) magnetostriction, exhibiting lattice-constant changes exceeding 10−3 at saturation. While they are widely used as ultrasonic transducers in the MHz regime, their ultrafast magnetization dynamics remain less explored.
We investigate the strain-driven magnetization dynamics in TbFe2 using time-resolved magneto-optical Kerr effect (trMOKE) and optical reflectivity measurements. The delayed strain response in the trMOKE signal indicates a true magnetic origin of these features, ruling out instantaneous changes of the optical constants. In addition, we show that glass-capped sample structures efficiently transduce unipolar strain pulses, which we use to calibrate the contribution of quasi-static-strain-induced magnetization dynamics to the total signal. Modeling with a Landau-Lifshitz-Gilbert equation including a time-dependent magneto-elastic field reproduces the observations and demonstrates that strain can even provide the dominant contribution to the laser-driven magnetization dynamics.
Keywords: Magnetostriction; Rare Earths; trMOKE