Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 17: PhD Symposium: Ultrafast spin-lattice interactions (joint session MA/AKjDPG)

MA 17.3: Invited Talk

Tuesday, March 13, 2018, 10:40–11:10, H 1012

Spin-Lattice coupling in ultrafast magnetization dynamics — •Bert Koopmans — Department of Applied Physics, and Institute for Photonic Integration (IPI),Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

Novel schemes for controlling the ferromagnetic state at the femtosecond time scale by pulsed laser excitation have received great current interest recently. Driving systems into the strongly non-equilibrium regime, it has been shown possible not only to fully quench magnetic order, and but even to reverse the magnetic moment by a single pulse.

In this tutorial I will start with a historical review of the field of fs control of the magnetic state by pulsed laser excitation, introduce some of the time-resolved experimental techniques, and discuss the key questions that need to be answered. Next, I will explain the role of spin-lattice coupling in the process of ultrafast loss of magnetic order, including the local dissipation of angular momentum via Elliott-Yafet spin-flip scattering. Also the importance of laser-induced spin currents will be emphasized. Experimental results on a variety of systems and materials will be compared to predictions by the so-called microscopic three-temperature model. The importance of tuning both spin-flip scattering and spin currents for establishing all-optical switching (AOS) of the magnetization will be highlighted. Some of our most recent experiments on AOS by single fs pulses in synthetic ferromagnetic systems will be discussed.