Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 63: [MA] Surface magnetism III

O 63.3: Talk

Thursday, March 17, 2011, 11:30–11:45, HSZ 103

Influence of the growth temperature on the electronic structure of ultrathin cobalt films studied by spin-resolved photoemission — •Cheng-Tien Chiang, Aimo Winkelmann, Martin Ellguth, Ahmet Akin Ünal, Christian Tusche, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle (Saale), Germany

We investigate the electronic structure of ultrathin cobalt films grown on Cu(001) by spin-resolved one- and two-photon photoemission (1PPE and 2PPE). A majority quantum well state located at 2.1 eV above the Fermi level and a minority surface resonance state at 0.4 eV below the Fermi level are identified in 6 monolayer thick cobalt films. The photoemission features of the quantum well state and the surface resonance state are strongly suppressed for cobalt films grown at 170 K as compared to films grown at 330 K. 2PPE through the quantum well state increases the photoelectron spin-polarization by about 10%, and in 1PPE a sign reversal of the spin-polarization is observed from the surface resonance state. These observations are applied for electronic state sensitive imaging of magnetic domains in energy- and spin-resolved photoelectron emission microscopy (PEEM).