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Start of funding 01.07.2003
Interaction of Spin Waves with Conduction Electrons in Magnetic Materials
Prof. Dr. Ralph Claessen
University of Augsburg
Lehrstuhl für Experimentalphysik II
Dr. Jörg Schäfer
University of Würzburg
Lehrstuhl für experimentelle Physik 4
Prof. Dr. Herbert Hopster
University of California, Irvine
Department of Physics and Astronomy
The electronic band structure in magnetic materials can be modified considerably by interactions with lattice instabilities and spin waves. Our group has developed special expertise in determining the electronic structure with angle-resolved photoemission (ARPES). Preliminary data of magnetic thin films suggest an electron renormalization by magnetic low-energy excitations (magnons). The ARPES technique will make it possible to identify the relevant electron bands, and to clarify energy scale and strength of the interaction. The studies aim at high-resolution ARPES data of the electron bands in Fe, Cr and Ni. This requires high-brightness synchrotron radiation available at the Advanced Light Source (ALS) in Berkeley, California. Such direct observation of electron band renormalization effects carries implications for magnetic devices and the fundamental understanding of excitations in solids.