SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.10: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Laser-induced metamagnetic phase transition of FeRh studied by combined UXRD and MOKE experiments — •Maximilian Mattern1, Jasmin Jarecki1, Vojtech Uhlir2, Jon Ander Arregi2, and Matias Bargheer1,3 — 1Institut für Physik und Astronomie, Universität Potsdam, Germany — 2CEITEC BUT, Brno University of Technology, Czech Republic — 3Helmholtz-Zentrum Berlin, Germany
We use time-resolved x-ray diffraction (UXRD) and the time-resolved polar magneto-optical Kerr effect (MOKE) to study the laser-induced metamagnetic phase transition in FeRh. The first-order phase transition from an antiferromagnetic (AFM) to a ferromagnetic (FM) phase is accompanied by a gigantic expansion (≈ 0.6%) of the unit cell. While UXRD access the transient FM volume fraction independent of the orientation of the magnetic moment probing the enhanced lattice constant, MOKE is sensitive on the orientation of the magnetization probing the net out-of-plane magnetization.
Our combined UXRD and MOKE experiments access the nucleation, growth and coalescence of the arising FM domains and disentangle their in- and out-of-plane expansion by comparing two samples, with a thickness below and above the optical penetration depth. The thin FeRh film displays a fluence-independent rise time of the FM phase of 8 ps and a much slower rise of the net magnetization within 150 ps starting 10 ps after excitation. For the inhomogeneously excited film, we observe a strong fluence dependence of these rise times originating from an out-of-plane growth of the FM domains by heat transport.