Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Magnetization / Demagnetization Dynamics II
MA 35.1: Talk
Wednesday, March 18, 2015, 15:00–15:15, EB 301
Ab initio calculations of laser-induced magnetism in materials — •Marco Berritta1, Ritwik Mondal1, Karel Carva1,2, and Peter M. Oppeneer1 — 1Uppsala University, Uppsala, Sweden — 2Charles University, Prague, Czech Republic
An intensive femtosecond laser pulse can induce a short-lived magnetization in materials through the inverse Faraday effect. This effect can be described
quantum-mechanically as a quadratic order response to the perturbing circularly polarized laser pulse. The magnitude of the light-imparted opto-magnetic field is thus far unknown; speculatively, it could be responsible for the recently demonstrated all-optical switching in magnetic recording materials [1]. We report ab initio calculations of the light-induced magnetization in typical ferromagnetic materials, Fe, Ni, and FePt. Results of full quantum quadratic response calculations are compared with results based on classical electron gas theory by Pitaevskii and an extension within the Drude-Lorentz theory. Support from the EU (under grant No. 281043, FemtoSpin) is acknowledged.
[1] C.-H. Lambert et al., All-optical control of ferromagnetic thin films and nanostructures. Science 345, 1337 (2014).