Study of domain wall dynamics in GdFeCo using double high-speed photography
Prabhakara K. H.1, Shapaeva T. B. 2, Yurlov V. V. 3, Zvezdin K. A. 4, Zvezdin A. K. 4, Davies C. S.5, Tsukamoto A.6, Kirilyuk A. I. 5, Rasing Th. 1, Kimel A. V. 1
1University of St. Radbaud, Institute of Molecules and Materials, Naimegen, Netherlands
2Lomonosov Moscow State University, Moscow, Russia
3Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudnyi, Russia
4Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
5University of St. Radbaud, Laboratory of Super-strong Magnetic Fields, Naymegen, Netherlands
6Nihon University, College of Science and Technology, Japan
Email: shapaeva@mail.ru, yurlov@phystech.edu, zvezdin@gmail.com, c.davies@science.ru.nl, a.kirilyuk@science.ru.nl, a.kimel@science.ru.nl

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Using the technique of double high-speed photography method, we show that an external magnetic field triggers in GdFeCo domain wall motion with velocities up to 1.2 km/s. The domain wall velocity saturates with an increase of the driving magnetic field. Contrary to earlier experiments on iron garnets, we did not succeed to detect any effect of femtosecond laser pulses on the domain wall velocity, even if the pulses were strong enough to reverse magnetization. Keywords: ferrimagnetism, domain wall dynamics, high-speed photography method, Faraday effect.
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