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MA: Fachverband Magnetismus
MA 5: Spin Textures and magnetic Phase Transitions
MA 5.6: Talk
Monday, March 7, 2016, 11:15–11:30, H34
Ultrafast cooling and heating mechanisms of the laser induced phase transition in CuO — •Johan Hellsvik1, Johan H. Mentink2, and José Lorenzana3 — 1KTH, Stockholm, Sweden — 2Radboud University Nijmegen, The Netherlands — 3ISC-CNR, Rome, Italy
We report theoretical modeling of the sub-picosecond magnetic phase transition [1] which recently has been experimentally observed in optically pumped samples of multiferroic CuO [2]. Using atomistic spin dynamics simulations we observe that independently of the excitation mechanism, the phase transition from collinear to spin-spiral order can proceed in exchange interaction driven dynamics on picosecond time scales. Intriguingly, different excitation mechanisms are found to drive distinct dynamics, in which the spin system either cools down or heats up on sub picosecond time scales [3].
[1] Johnson et al., Phys. Rev. Lett. 108, 037203 (2012) [2] Kimura et al., Nat. Mater. 7, 291 (2008) [3] Hellsvik et al., arXiv:1509.03202