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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).