Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Electronic structure I

O 6.7: Vortrag

Montag, 23. März 2009, 12:45–13:00, SCH A216

Y(0001) bulk crystal - An adequate substrate for the growth of Gd(0001) films? — Michael Budke, Tobias Allmers, •Karen Zumbrägel, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster

With a negligible lattice mismatch and identical crystal structure, Y commends itself as the ideal substrate for Gd thin film growth. We report on the growth, magnetism and electronic structure of Gd(0001) films grown on a Y(0001) bulk crystal in comparison with films grown on W(110). By combining scanning tunneling microscopy, low-energy electron diffraction, magneto-optical Kerr-effect measurements, as well as direct and inverse photoemission in one ultra-high vacuum system, we are able to provide a detailed characterization of the obtained films. As one of the main criteria we discuss the appearance of the surface state near the Fermi energy. Our results show that although bulk Y crystals suffer from naturally occurring impurities, they are nevertheless a good alternative to W(110) substrates for the growth of Gd.