 He has pioneered x-ray magnetic spectro-microscopy which allows the direct observation of nanoscale antiferromagnetic and ferromagnetic domain structures with elemental and chemical state specificity.He has also pioneered time-resolved x-ray microscopy techniques with picosecond time resolution.These studies and more generally the whole field of magnetism form the topic of his second book, “Magnetism – From Fundamentals to Nanoscale Dynamics” (Springer, 2006), which he co-authored with Hans Christoph Siegmann.