Sub-nanosecond magnetization dynamics of small permalloy (Ni80Fe20) elements has been investigated with a new full-field transmission microscope at the soft X-ray beamline P04 of the high brilliance synchrotron radiation source PETRA III. The soft X-ray microscope generates a flat-top illumination field of 20 μm diameter using a grating condenser. A tilted nanostructured magnetic sample can be excited by a picosecond electric current pulse via a coplanar waveguide. The transmitted light of the sample plane is directly imaged by a micro zone plate with < 65 nm resolution onto a 2D gateable X-ray detector to select one particular bunch in the storage ring that probes the time evolution of the dynamic information successively via XMCD spectromicroscopy in a pump-probe scheme. In the experiments it was possible to generate a homogeneously magnetized state in patterned magnetic layers by a strong magnetic Oersted field pulse of 200 ps duration and directly observe the recovery to the initial flux-closure vortex patterns.
A full-field transmission x-ray microscope for time-resolved imaging of magnetic nanostructures
J. Ewald, P. Wessels, M. Wieland, T. Nisius, A. Vogel, G. Abbati, S. Baumbach, J. Overbuschmann, J. Viefhaus, G. Meier, T. Wilhein, M. Drescher; A full-field transmission x-ray microscope for time-resolved imaging of magnetic nanostructures. AIP Conf. Proc. 28 January 2016; 1696 (1): 020005. https://doi.org/10.1063/1.4937499
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