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Ultrafast dynamics of orbital angular momentum of electrons induced by femtosecond laser pulses: Generation and transfer across interfaces

O. Busch, F. Ziolkowski, I. Mertig, and J. Henk – 2023

The orbital angular momenta (OAM) of electrons play an increasingly important role in ultrafast electron and magnetization dynamics. In this theoretical study, we investigate the electron dynamics induced by femtosecond laser pulses in a normal metal, a ferromagnet, and a ferromagnet/normal metal heterostructure. We analyze the spatiotemporal distributions of the laser-induced OAM and their respective currents. Our findings demonstrate that a circularly polarized laser pulse can induce a sizable and long-lasting OAM component in a normal metal. Furthermore, an interface between a ferromagnet and a normal metal facilitates the demagnetization of the magnet by the OAM contribution to the total magnetization. Finally, to transfer OAM from a ferromagnet into a normal metal, it is advantageous to use a laser setup that induces the desired OAM component in the ferromagnet, but not in the normal metal.

Title
Ultrafast dynamics of orbital angular momentum of electrons induced by femtosecond laser pulses: Generation and transfer across interfaces
Author
O. Busch, F. Ziolkowski, I. Mertig, and J. Henk
Keywords
Laser-induced demagnetization, Spin dynamics, Spin-orbit coupling, Ultrafast magnetization dynamics, Ultrafast phenomena, Angular momentum
Date
2023
Identifier
DOI: 10.1103/PhysRevB.108.104408
Appeared in
Phys. Rev. B 108, 104408 (2023)
Type
Text