Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.23: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Microscopic investigation of laser-induced ferromagnetic domain formation in FeRh thin films and microstructures — •Ahmet Akin Ünal¹, Adem Parabas², Yuriy Aleksandrov³, Hatice Doganay⁴, Florian Kronast¹, and Fikret Yildiz² — ¹Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — ²Gebze Institute of Technology, Department of Physics, Kocaeli, Turkey — ³Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ⁴Forschungszentrum Jülich, Peter Grünberg Institut (PGI-6), Jülich, Germany

The temperature dependent transition from the antiferromagnetic (AF) to the ferromagnetic (FM) order in FeRh takes place via nucleation and growth of microscopic magnetic domains. Since this transition can be induced by femtosecond laser pulses, FeRh has become a promising material for establishing ferromagnetism in ultrashort time scales. Although the system is extensively investigated, the dynamics of the FM domain formation and the subsequent disappearance in the AF matrix is still under strong debate. A better understanding of the AF-FM phase coexistence at the microscopic level and of the parameters influencing the FM domain evolution such as sample temperature and laser fluence is important for device applications. Here, we report our recent magnetic imaging experiments in FeRh thin films and microstructures using X-ray photoemission electron microscope.