Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Poster I

MA 10.46: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Threshold photoemission magnetic circular dichroism at the spin reorientation transition of ultrathin epitaxial Pt/Co/Pt(111)/W(110) films — •Kerstin Hild, Jakob Emmel, Gerd Schönhense, and Hans-Joachim Elmers — Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany

We report on the thickness dependence of threshold photoemission magnetic circular dichroism (TPMCD [1]) in one-and two-photon photoemission (1PPE and 2PPE) for a Pt-capped ultrathin Co wedge grown on Pt(111)/W(110) using femtosecond laser light. TPMCD measurements result in asymmetries continuously increasing with the sample thickness. This indicates that the TPMCD asymmetry is dominantly influenced by the Co bulk properties. At 5 monolayers (ML) asymmetry values of 0.07 % for 1PPE and 0.11 % for 2PPE are derived. The spin reorientation transition is detected at a Co thickness of 5.5 ML. For the perpendicularly saturated sample the TPMCD does not depend on the orientation of the easy axis. The comparison of the 2PPE TPMCD asymmetries with measured Kerr ellipticities in the framework of the Jones formalism reveals considerable differences between both quantities.

Funded by DFG (EL 172/15-1), the Carl-Zeiss-Stiftung and the Graduate School of Excellence MAINZ (Kerstin Hild). [1] K. Hild et al., J. Phys.: Condens. Matter 20, 235218 (2008).