Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Spin Dynamics and Transport: Ultrafast Effect

MA 23.1: Vortrag

Dienstag, 21. März 2017, 09:30–09:45, HSZ 403

Terahertz Radiation Driven Dynamics of Magnetic Domain Structures Probed by Free-Electron Laser Light — •L. Müller1, M.H. Berntsen2, W. Roseker1, A. Philippi-Kobs1, T. Golz1, K. Bagschik3, J. Wagner3, R. Frömter3, N. Stojanovic1, C. Gutt4, H.P. Oepen3, and G. Grübel11Deutsches Elektronen-Synchrotron DESY, FS-CXS, Hamburg, Germany — 2KTH Royal Institute of Technology, Stockholm, Sweden — 3Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Hamburg, Germany — 4Department of Physics, University of Siegen, Siegen, Germany

Controlling magnetism on ultra-fast time scales and on nanometer length scales is a challenge for modern research in magnetism, with direct implication for future data storage devices. Means for inducing dynamics on these time scales are femtosecond optical lasers and, more recently, THz sources. Probing the dynamics on a nanometer length scale has become possible with free-electron laser sources. We report on a THz-pump–XUV-probe scattering experiment on (Co/Pt)n multilayers (n = 8, 16) with perpendicular magnetic anisotropy exhibiting a maze domain pattern. An electromagnetic undulator installed at FLASH behind the permanent-magnet FEL undulator was used to produce 10-cycle linearly polarized THz pulses. The fundamental wavelength was set to 150 µ m and higher harmonics down to 30 µ m have been used as a pump. The resulting dynamics have been probed on femtosecond time scales by resonant magnetic small-angle scattering at the cobalt M2,3 edge.

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