Hemholtz-Zentrum Berlin für Materialen und Energie

The Helmholtz Zentrum Berlin (HZB) was founded by merging the former Hahn-Meitner-Institut Berlin (HMI) and the Berliner Elektronenspeicherring-Gesellschaft für Synchrotron-strahlung (BESSY), two of Berlin's largest research centers. It operates two scientific large scale facilities for investigating the structure and function of matter: the research reactor BER II for experiments with neutrons and the synchrotron radiation source BESSY II, producing ultra bright photon beams ranging from Terahertz to hard X-rays. Within the HZB the Institute for Methods and Instrumentation in Synchrotron Radiation Research, led by Prof. A. Föhlisch, develops innovative Synchrotron and X-ray methods for the central scientific questions at HZB and enables and advances the synchrotron radiation research of the user community. Key methods are spectroscopy and scattering at the frontiers of energy, momentum and time resolution. Within the in-house-research program, one prominent topic is the investigation of ultrafast phenomena using fs soft x-ray pulses. These pulses are produced by the HZB femtoslicing facility. Circularly polarized soft x-ray pulses allow to probe magnetic dynamics element selectively and to separate orbital and spin contributions. They are therefore a key experimental tool for studies of ultrafast magnetism. Currently, such fs soft x-ray pulses with circular polarization are only available at the HZB femtoslicing source.


Role in the Network

HZB will work on experiments in close collaboration with the Radboud University Nijmegen on time-resolved magnetization dynamics experiments. It will provide its expertise in the field of X-ray absorption spectroscopy and X-ray magnetic circular dichroism measurements on the ultrafast time scale.

Members Involved in Femtospin

Prof. Dr. Alexander Föhlisch

Dr. Christian Schüßler-Langeheine

Dr. Ilie Radu



Publications Relevant to the Project

I. Radu et al. Nature 472, 205-208 (2011) (read more).

C. Stamm et al. Nature Materials 6, 740 (2007) (read more).

C. Stamm et al. Phys. Rev. B 81, 104425 (2010) (read more).

C. Boeglin et al. Nature 465, 458 (2010) (read more).