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Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Surface Magnetism / Magnetic Imaging II

MA 31.5: Vortrag

Donnerstag, 25. März 2010, 16:15–16:30, H23

Unoccupied quantum-well states in Co/Cu(001): Spin-orbit coupling and magnetic linear dichroismCheng-Tien Chiang, Aimo Winkelmann, Ping Yu, Jürgen Kirschner, and •Jürgen Henk — Max Planck Institute of Microstructure Physics, Halle, Germany

A prerequisite for magnetic linear dichroism (MLD) is the hybridization of electronic states due to spin-orbit coupling (SOC). The spz quantum well states in thin Co films on Cu(001) are marginally affected by SOC but nevertheless exhibit a sizable MLD in two-photon photoemission (2PPE) [1], thereby questioning the established origin of MLD.

To resolve this conflict, we performed extensive 2PPE experiments which are completed by electronic-structure, photoemission, and analytical calculations. Having obtained this way a detailed characterization of the quantum well states, the MLD is fully explained; it turns out that a key issue is the proper choice of light polarization. Other sources of the MLD, e. g., the occupied Co states, are ruled out.

Our joint investigation establishes that MLD in 2PPE is a valuable tool for probing SOC in unoccupied electronic states.

[1] C.-T. Chiang, A. Winkelmann, P. Yu, and J. Kirschner, Phys. Rev. Lett. 103, 077601 (2009).

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