Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Focus Session: Nanomagnetism in the x-ray spotlight

MA 2.5: Hauptvortrag

Montag, 12. März 2018, 11:45–12:15, H 1012

A time-resolved view on magnetic domains and spin textures by x-ray holography — •Stefan Eisebitt — Max Born Institute, Berlin, Germany

Fourier transform X-ray holography is a high resolution imaging technique when performed with soft x-rays.[1] As it is based on interference of an object beam with a reference beam, it requires coherent illumination and is thus particularly well suited for use at 3rd generation and diffraction limited storage rings and free electron lasers. When combined with magnetic contrast via x-ray magnetic circular dichroism, it has been very successfully used for the study of magnetism on the nanometer length scale. I will briefly review the specific capabilities of this imaging approach, where a single hologram can be used to encode images of several samples simultaneously, of a sample seen at different x-ray wavelengths, of a sample seen at different times or including 3D information.[2] Results of the first time resolved experiments at synchrotron sources and free electron lasers down to femtosecond temporal resolution will be presented, including work on skyrmions and magnetic data storage [3,4,5] and ultrafast light-induced manipulation of magnetization.[6] [1] S. Eisebitt et al., Nature 432, 885 (2004). [2] B. Pfau and S. Eisebitt, X-ray holography, in: ISBN 978-3-319-14395-8 (2016). [3] B. Pfau et al.:, Appl. Phys. Lett. 99 062502 (2011) & Appl. Phys. Lett. 105 132407 (2014) [4] F. Büttner et al., Nature Physics 11, 225 (2015). [5] F. Büttner et al., Nature Nanotechnology 12, 1040 (2017) [6] von Korff Schmising et al., Phys. Rev. Lett. 112 217203 (2014).