Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Magnetization / Demagnetization Dynamics II

MA 14.7: Vortrag

Montag, 20. März 2017, 16:45–17:00, HSZ 401

All-optical switching and ultrafast magnetization dynamics in Pt/Co multilayers — •Umut Parlak, Roman Adam, Moritz Plötzing, Daniel E. Bürgler, and Claus M. Schneider — Peter Grünberg Institut, PGI-6, Research Centre Jülich, 52425, Jülich, Germany

The observation of all-optical switching (AOS) in ferromagnetic thin films raised many questions concerning the nature of magnetization reversal. Recent studies suggest that the interplay between light-induced sample heating and light helicity plays a crucial role in achieving an efficient switching [1]. We investigate the effect of laser pulse duration, number of pulses, fluence and polarization state of the beam on the AOS efficiency in [Pt/Co]_N multilayers, where N varies from 3 to 9. The response of the samples to the laser light was detected using a magneto-optical Kerr effect (MOKE) microscope combined with the laser system. Our results indicate that AOS probability depends on precise tuning of the above-mentioned laser parameters, and it scales with the number of pulses per illuminated area. Moreover, the dynamics of the AOS and demagnetization processes have been found to depend not only on laser fluence and external magnetic field, but also the multilayer repetition number. [1] Cornelissen, T. D., Córdoba, R., and Koopmans, B. (2016). Microscopic model for all optical switching in ferromagnets. Applied Physics Letters, 108(14), 142405.