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MA: Fachverband Magnetismus

MA 42: Posters Magnetism I

MA 42.18: Poster

Mittwoch, 18. März 2020, 15:00–18:00, P3

Plasmonic Field Confinement for Ultrafast High-Harmonic Dichroic Microscopy — •Jakob Hagen, Sergey Zayko, Ofer Kfir, and Claus Ropers — 4th Physical Institute, University of Göttingen, Germany

The response of magnetic materials to abrupt laser excitation indicates evidences of intriguing femtosecond dynamics [1]. While a number of spectroscopic techniques were developed to get access and, potentially, unveil the physics behind this phenomenon, the direct observation of nanoscale spin dynamics in real space remains challenging [2] since it requires a nanometric resolution imaging, femtosecond temporal resolution and also nanoscopic excitation. In this study we develop such an excitation to trigger femtosecond spin dynamics, based on plasmonic nanostructures fabricated by electron beam lithography. These structures complement the nanometric imaging resolution using femtosecond pulses of high harmonic radiation [3]. This work would enable versatile sub-wavelength illumination profiles of the magnetic structure and may allow for magnon-selective excitation.

[1] E. Beaurepaire et al., Phys. Rev. Lett., 76, 22 (1996) [2] C. von Korff Schmising et al., Phys. Rev. Lett., 112, 217203 (2014) [3] O. Kfir et al., Sci. Adv., 3 (12), eaao4641 (2017).