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Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Magnetization / Demagnetization Dynamics II

MA 14.1: Vortrag

Montag, 20. März 2017, 15:00–15:15, HSZ 401

Ab initio theory of laser-induced magnetization in longitudinal and transversal configurations — •Marco Berritta, Ritwik Mondal, and Peter M. Oppeneer — Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden

All-optical helicity-dependent magnetization switching has recently emerged as a promising way to control a material’s magnetization using short optical laser pulses1. A precise understanding of the underlying mechanism has not yet emerged, but it is expected that a nonlinear opto-magnetic effect, the inverse Faraday effect (IFE), plays a role to coherently induce magnetization which assists switching. We have recently developed a quantum theory2 to calculate ab initio the laser-induced magnetization in ferromagnetic materials in longitudinal configuration, i.e., when the incoming light is parallel to the magnetization direction. We have extended our theory to treat the transversal configuration where the induced magnetization is normal to the existing magnetization and will thus exert a torque on it. Moreover, we have extended the theory to compute the site- and element-resolved contributions of the IFE in multi-sublattice compounds. Our results provide a roadmap for engineering suitable compounds and manipulating them in optimal configuration to achieve ultrafast magnetization switching.
C.-H. Lambert et al., Science 345, 1337 (2014); R. John et al., arXiv: 1606.08723 (2016).
M. Berritta, R. Mondal, K. Carva, P.M. Oppeneer, Phys. Rev. Lett. 117, 137203 (2016).

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