The fundamental understanding of ferromagnetism is crucial to the emergent field of spintronics. Our group tackles the challenge by probing the band structures of ferromagnetic materials which have been the most direct method to explain properties in materials. Recently, our group studied the hitherto unknown non-local electron correlation in an itinerant ferromagnet. Contrary to the assumption of most theoretical models, we demonstrated that non-local electron correlations needed to be taken into account in the manifestation of complex self energy in electronic structure of ferromagnets 1.
Our group also investigated the generation of spin-polarized electrons from a ferromagnetic 2D electron gas in an ultra-thin ferromagnetic. In this study we employed two-photon photoemission to excite the highly spin-polarized electrons from an ultra-thin cobalt film to majority-spin quantum well states derived from an s p band at the border of the Brillouin zone. 2
- Nonlocal electron correlations in an itinerant ferromagnet Tusche, C.; Ellguth, M.; Feyer, V.; Krasyuk, A.; Wiemann, C.; Henk, J.; Schneider, C. M. & Kirschner, J. Nature Communications , Vol. 9 , 2018
- Optical Generation of Hot Spin-Polarized Electrons from a Ferromagnetic Two-Dimensional Electron Gas Ellguth, M.; Tusche, C. & Kirschner, J. Physical Review Letters , Vol. 115 , 2015