Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 5: Magnetization/Demagnetization Dynamics
MA 5.7: Vortrag
Montag, 20. März 2017, 11:15–11:30, HSZ 401
Ultrafast Lorentz microscopy of nanoscale magnetization dynamics — •Nara Rubiano da Silva1, Marcel Möller1, Tim Eggebrecht2, Jan Gregor Gatzmann1, Armin Feist1, Ulrike Martens3, Henning Ulrichs2, Markus Münzenberg3, Claus Ropers1, and Sascha Schäfer1 — 14th Physical Institute, University of Göttingen, Germany — 21st Physical Institute, University of Göttingen, Germany — 3Interface and Surface Physics, University of Greifswald, Germany
Lorentz microscopy is an established technique for the nanoscale mapping of magnetic structures, exceeding the diffraction-limited resolution of magneto-optical microscopy [1]. However, time-resolved implementations of this method have remained elusive, due to the lack of pulsed electron sources of sufficient brightness and coherence.
Here, we present the implementation of Lorentz microscopy within the ultrafast transmission electron microscope (UTEM) recently developed in Göttingen [2]. We employ highly coherent, sub-ps electron pulses to study laser-induced demagnetization dynamics in permalloy nanostructures. Our approach offers fascinating prospects for elucidating ultrafast spin dynamics and light-induced magnetic textures [3] on the nanoscale.
[1] N. O. Urs et al., AIP Advances 6 (2016).
[2] A. Feist et al., under revision, arXiv:1611.05022 (2016).
[3] T. Eggebrecht et al., under revision, arxiV:1609.04000 (2016).