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MA: Fachverband Magnetismus

MA 31: Magnetization and Demagnetization Dynamics II

MA 31.2: Talk

Wednesday, March 9, 2016, 09:45–10:00, H34

Ultrafast All-Optical Control of Magnetization on the Nano-Scale — •D. Weder¹, C. von Korff Schmising¹, C. M. Günther², M. Schneider¹, B. Pfau³, B. Vodungbo⁴, E. Jal⁴, J. Lüning⁴, F. Capotondi⁵, and S. Eisebitt¹ — ¹Max-Born-Institut, 12489 Berlin — ²Technische Universität Berlin, 10623 Berlin — ³Lund University, S-22100 Lund — ⁴Sorbonne Universités, 75005 Paris — ⁵Elettra-Sincrotrone Trieste, 34149 Basovizza, Trieste

All optical control of magnetization is emerging as a general phenomenon in solid state physics applicable to an ever growing number of magnetic systems [1], including high anisotropy ferromagnetic Co/Pt multilayers [2], technological one of the most important class of materials for ultra-high-density magnetic recording. However, to compete with the bit density of conventional storage devices, all-optical magnetic switching applications rely on sub-wavelength spatial confinement of the optical excitation as well as control of non-local phenomena like super-diffusive spin and electron transport. We engineer sub-wavelength spatial localization of the optical excitation with lithographically fabricated proximity masks and induce tailored transient magnetic gratings and arrays. Extreme ultraviolet radiation from a free electron laser (FERMI, Elettra) is used in a combination of resonant magnetic small angle X-ray scattering and Fourier transform holography imaging experiments [3] giving direct access to the ultrafast evolution of the lateral magnetization on a nanometre length scale. [1]Mangin et al., Nat. Mat., 13, 286 (2014), [2]Lambert et al., Science, 345, 1337 (2014), [3]Korff Schmising et al., PRL, 112, 217203 (2014)