Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.27: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Ultrafast Lorentz microscopy: towards femtosecond imaging of magnetization dynamics — •Nara Rubiano da Silva1, Marcel Möller1, Jan Gregor Gatzmann1, Armin Feist1, Tim Eggebrecht2, Ulrike Martens3, Henning Ulrichs2, Vladyslav Zbarsky2, Markus Münzenberg3, Claus Ropers1, and Sascha Schäfer114th Physical Institute, University of Göttingen, Germany — 21st Physical Institute, University of Göttingen, Germany — 3Interface and Surface Physics, University of Greifswald, Germany

Lorentz microscopy (LM) enables magnetization imaging with a spatial resolution reaching 2-20 nm [1]. Based on this technique, we have developed two approaches to address rapid magnetization processes triggered by femtosecond laser excitation. In a first approach, irreversible changes of the magnetic structure after single excitation pulses are sampled via static LM. In continuous Fe thin films on a SiN substrate, we observe the laser-induced formation of a dense vortex/antivortex network that is metastable at room temperature [2]. Furthermore, we will present first results from the implementation of a laser-pump/electron-probe scheme in a transmission electron microscope. This instrument will be capable of elucidating ultrafast spin dynamics in magnetic nanostructures using highly coherent femtosecond electron pulses.

[1] J. N. Chapman et al., J. Magn. Magn. Mater. (1999).

[2] T. Eggebrecht et al., submitted.

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