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. Author manuscript; available in PMC: 2021 Aug 8.
Published in final edited form as: Nat Mater. 2021 Feb 8;20(5):607–611. doi: 10.1038/s41563-021-00922-7

Fig. 4. Ultrafast phonon-induced magnetic phase transition.

Fig. 4

(a) Time-resolved dynamics of the polarization rotation θ R at T = 45K for various fluences of the pump. Each trace is obtained by subtracting individual traces obtained for opposite polarities of the external magnetic field to highlight magnetic components of the dynamics. Inset: Schematics of the ballistic reorientation in the altered magnetic potential Ƒ. (b) Amplitude of the transient magnetization ΔM as a function of the pump fluence I. (c) ΔM as a function of the sample temperature for fluences I above (blue curve) and below (red curve) the threshold I c. (d) A direct comparison of the dynamics of the magnetization initiated by a pump pulse with above-bandgap photon energy (2.3 eV) and in resonance with the phonon mode (85 meV). a.u., arbitrary units.